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Discuss anything aquarium related here, including inhabitants, decor and issues.
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Feel free to ask questions but know that there are a lot of resources out there that could answer your question a lot faster and accurately than /an/.
Make sure to include these things in your post before asking because we can't help you if we don't have the full picture:
-any and all inhabitants + how long you've had them
>How to cycle your tank: http://pastebin.com/x4WnB0Ah
>General aquarium care sheets - http://www.aquaticcommunity.com/
>Livestock and plants for sale - http://www.liveaquaria.com/ http://www.aquabid.com
>FUCKING GOOGLE - http://www.google.com
That's a different anon pretending to be me to get reactions, I won't put anything in that isn't either native to my state , or stocked by the state meaning they want them in the waters
Like I've said before it won't be pretty like at all , but hopefully il be able to grow some nice size fishes in it
Not like there's much else to do with this weather , too cold for normal fishing , not enough ice for ice fishing , too cold for kayaking, I've already organised my entire garage, its a bit too cold to dirtbike
So why not dig a pond? The physical activity helps keep me warm and busy
Not super worried about critters, if I have any (serious) issues il just trap them since I do have my trapping license
Posted this in the other thread before I realized there was a new one up, so sorry for the repeat. If a pleco is being bitten, it would move the fuck out the way, right? I don't know if my shark is nipping him or simply nudging him, but the pleco doesn't move.
Little. I think it might be a female now that I look more closely, she's a 1.5 inch albino bristlenose. I just saw her move when the shark nudged/nipped near her eye, so I guess she does move if she's going to be damaged. I'm just worried about her taking bites from some of the bigger fish.
Oh I see. You won't be able to tell sex until they are fully grown and get bristles. Females get little to none. Mines only a little over an inch and fights off the others bottom feeders.
My bristlenose is letting pretty much every fish in the tank nudge/nip her. She does move sometimes, she moved when a tetra got her (it was an obvious bite). I'm wondering if the shark and now the kuhli loach aren't actually nipping her. I imagine if they hurt her, she'd gtfo.
Yep. Two pieces of driftwood that form little caves, one of which is absolutely covered in moss. I'll have to get a bigger one as she grows, I'm on the search for the perfect piece of driftwood so I can do some actual nice aquascaping.
I'm female, and there are probably others. I just don't announce that I'm female upon entering a thread. That would be silly.
Someone gave me this piece of driftwood on a slate stand. I think it looks nice.
Delhezi just arrived along with African brown Knifefish. Incoming pic of them.
Have you checked for ich? It can be hard to spot on the albino plecos.
It has roughly as much floor space as a 5 gallon, so as long as you stock with fish that you would normally be okay with putting in a 5 gallon, it's fine. Personality I think it would be great as a shrimp tank with some manzanita branches spanning the full height of the column, maybe with some microrasboras.
Could you maybe find a 16 inch cube? It would be a lot better for stocking fish (256in2 vs 144in2).
One more thing, are biocubes worth the ridiculous price? I know one LFS carries them, but they seem to be incredibly overpriced. Do they have special functions or something that causes the high price?
It's for the sake of having everything look more streamlined, with no separate units for lighting or filtration. They have wet/dry filters, which are one of the only types that can get rid of nitrates, and I believe they also come with a built in skimmer, but that's of limited use with a freshwater tank.
>"29 gallon Biocubes are so expensive!"
>"How about this 3 gallon knockoff as an alternative?"
Yes, they definately are worth it as an upgrade. But I would never pay full price for one. Check craigslist frequently, they are often on there for less than 100 bucks. Theres a 24 gallon JBJ nano w/ t5's for sale on my local hobbyist facebook page for only 50 bucks, totally worth every penny.
Little bro wants me to set up a tank for him. He's mainly looking for a solitary aggressive fish that will be fine on it's own, like an oscar. The only problem is that the only tank I have spare is a 50g. What fish would be suitable for that? I've been thinking a blue acara, but tell me if you have any recommendations.
And no, it doesn't have to be a cichlid.
Electric blue acara. I have one. Ate all my guppys. Is he looking for some super mega vicious rip fish apart fish while he masturbates fish? I've had a brown Knifefish (not the ghost knife kind) for years and he's at 7 inches and is cool, solitary, and something different
How do you guys get your water so absolutely pristine and clear?
My water (when i had a tank) was mostly clear but sometimes had a very slight yellow tint when looked at outside of the aquarium, the levels were all normal too
been lurking on these threads for a few weeks, here's my current set up in a 3 gallon tank, it holds 1 male African clawed frog and a few moss balls of varying sizes, any recs?
I prefer having the slight orange tint, I think it makes my fish look a bit more like they were actually in their natural habitats, but if you want pure water your best bet is to go for LED lighting (for a pure white/slightly blue base), not having a piece of wood (will release tannin into the water to dye it slightly brown), and using a treatment like AquaClear (to remove chemicals from tap water and bind particles in the tank). Another good idea is to get a filter with active carbon, which will also strip particles out of the water.
I'm not fond of them, but that's because I don't like their stands. I prefer sturdier ones that I can also use for non-fish stuff, like my current tank is on top of my bedroom dresser while the stand is wrapped in plastic in my garage. By all accounts solid tanks and good furniture, just not my taste is all.
>taking pictures of fish
>trying to get pics of one particular fish
>one angelfish is enthralled by camera
>gets in the way of every shot
Well, I have like twenty pics of the same angelfish now.
I've had a male in my 40 breeder for about four months. Got another male and two females about a month ago and moved them from quarantine just yesterday. My bristlenose pleco liked to chase chase the one around and beat him up, I'm hoping that'll change with the new additions.
What kind of information were you looking for?
Try African brown knifefish. Or the acara my acara is territorial and was attacking the Knifefish and Bichir but has stopped and accepted them. But he will be moving soon as I change it slowly into w African tank.
I know what you mean. As soon as I approach the tank my angelfish always swim right up to the glass and follow me around, getting in the way of whatever fish I'm actually trying to look at or photograph.
Cichlids are attention whores.
Diana Walstad's book mentions allelopathy, which in the most ghetto terms, deals with the presence of plant A affecting the development of plant B, because the plants emit chemicals or some shit. Basically a plant can stunt the growth of another plant, or alternatively enhance it. Natural selection at work.
I feel like I've experienced this. I've had plants that used to grow like weeds basically fizzle and damn near die out after the introduction of another plant.
Sadly I don't see any kind of hard data collected in this realm. It would be interesting to be able to chart plant compatibility.
All said, I wonder if plants from nearby regions and habitats would "get along" better. I guess this is all very pseudoscientific, but would a tank comprised of plants from just Southeast Asia flourish better than a tank with plants from pretty much every continent on the globe?
If you want perfectly crystal clear water then use something like this. But remember, this would be completely separate from your normal filter, otherwise you are torturing your fish by throwing away the bacteria and forcing them to cycle over and over again.
They're supposedly some of the smartest fish (not that it says much considering how dumb most fish are), but I definitely agree that their personalities are the most distinctive ones in my tank.
plants only affect eachother if they arent getting what they need and "feel" the need to compete.
if you give them plenty of nutrients and Co2 they shouldnt mess with eachother
plenty of land plants will do this too when the soil is depleted of nutrients
I wish all the cuckweed in my tank would fucking just die
I'm putting in a circulation fan to hopefully make conditions less ideal for it to propagate and eventually die, but it's been a pain in the ass to also save my water lettuce, water sprite, and even my spiky moss which is catching sinking duckweed by the ton
It'd probably feel like 80 grit sandpaper. They use their mouths to scrape at wood.
I've been netting it out since yesterday, I think I got like 80% of it. I also saved my water sprite and lettuce and put it in a bowl for later, which also undoubtedly has duckweed hitchhikers I have to scan for later
I can't even drydose my tank with ferts, I'm sure my crypts and moss will survive a few weeks but I'm still irritated
I'm dealing with the same thing in my tank. I decided yesterday to just net everything out with the water lettuce. After I'm sure I've gotten it all I'm going to put some more water lettuce in from another tank. It's such a plague. I started with two or three leaves that hitchhiked and by yesterday it covered a third of my 40 gallon.
Would look nicer with some floating plants imo, just not duckweed. I'm really fond of how Salvinia minima looks in my nano. Pretty, easy to deal with, and no fuckhuge roots that take over small tanks.
Which pea puffer are you talking about? seriouslyfish says you can keep just one in as tiny as a 12"x8"x8" tank
I don't want to disturb the substrate as much as possible, and I want to keep dosing column ferts. I guess I'll just have to wait a week or two before refertilizing again after I scoop out duckweed everyday
>catfish is upside down
>reflection is right side up
This is disorienting.
I used to have a little 1 gallon betta cube kind of just like that.
Planted some baby tears and kept a few shrimp & snails inside! Kept a little 5 watt heater inside and made my own mini trickle down filter + sump for it too!
Despite being regarded as "torture" chambers for betta fish, they still have plenty of other uses that people can get out of them as long as you're creative.
I finally got some fish I actually want in my 30 gal. Got 10 ember tetras and 10 neons. The embers are fantastic, they swim all over, in through the plants and ate even today on their very first day, I even saw some mating displays. The neons were boring as shit at first, cowering behind my Java ferns for a while but they have started to become more adventurous. All in all I think ember tetras are my new favourite small fish.
>no one has made the 1 gallon super betta bowl with built in filter heater controller light dimming timer easy to do water change drainer and filler
Maybe I should just do it...
>seriouslyfish: 3.3 gal
>aquariumwiki: 5 gal
>badmanstropicalfish: 3 gal
>aqadvisor: 5 gal
Recommendations are all over the place. People who actually have experience keeping them almost always cite the 3-5 gallon recommendations, and usually note that they're just difficult to clean up after.
>People who actually have experience keeping them
the quantity of the experience matters.
I never take advice from /aq/ for instance. Sure, a lot of people here have some experience keeping certain animals, but unless they've been keeping the same animal alive for at least five years nothing they could possibly say would sway me.
Not that I care about your silly little argument about pea puffers. I just gave you a citation from a well-respected and almost unanimously trusted source.
The same site says Kuhli Loaches need 50 gallons minimum while Blue Gouramis only need 20 gallons
I think I'd rather trust an anon quoting 4 reputable online sites for fishkeeping vs a moron citing online retailer recommendations
I just went ahead and sacrificed my other floating plants along with the duckweed. Figured I'd replace them later.
People who sell floating plants with duckweed hidden in it should go to hell.
It is a true fact. My room mate took a shit in my tank with green terror and Bichir and they lived and are still alive. Do that in a salt water tank and the first drop of poop kills everything almost immediately.
Ok sure, if i pour Bleach, or hostile Bacteria in a Tank of course stuff will die.
But belive me, you only have to monitor the Tank a bit more than a freshwater Tank. But the workload is the same
I have a 5 gal mixed reef tank with two red bubble tip anemones.
Do these harm other coral just by their touch or do they also secret toxins into the water?
Zoanthus, SPS and softcoral are slowly going down; Corallimorpharia, Gorgonia and Pavona are doing fine.
Not sure if these developments are connected to the rise of the bubble tip anemones.
anemones have toxins in their tentacles. But they tend to wander around, but without knoledge of the waterstats its hard to say.
SpS are hard to care for. Enough light? Enough Current?
So pea puffers and scarlet badis are in the expert level range or something? I have both, but I don't understand what would make them difficult to care for.
yeah, i know, but i don't have any test, because it's just a cheap, small tank.
It is running for more than 4 years now and sps were doing okay to fine before.
I had to move my two sps stocks a little lower and i also have a hermit crab now which needs some food; so maybe it's good nutrition which caused the anemones to grow huge lately.
I guess there is not enough space and light to keep both anemones and sps anyway and I might as well enjoy watching the anemones win.
pic taken in 9/14
yep, its way to crwoded in there. Corals make them self space with Poison, so the Quadricolor porbably Kills the other stuf.
The Hermitcrabs dont need extra food, you have enough algae in there
yes, you are right.
If I'd gave the Quadricolor away, Xenia would be on top again, which would cause a lot of gardening to regain space for sps.
Aestheticallywise I think that a colourful sps on top would look better and that Quadricolor is way too big.
You'd wonder, only the parts of the colony in direct proximity to the anemone and in dark shadow die, the others mostly open and grow, at least on the gorgonia.
I now changed the place of the brown Montipora SpS to the left side holder thingi and ditched the almost dead Seriatopora inside.
Maybe the Monti will recover; it got more light and stronger current now.
>I'd rather trust the business over the informative articles
They're considered as much. As soon as any freshwater fish "requires" live food and careful monitoring of water quality, it's expert level. They're certainly more involved than gourami or livebearers.
Your fish are cute btw. I enjoy when you post them.
Articles written by anyone that can also be edited by anyone. I wish death upon anything you own from now until the nd of your pathetic mongloid life. Nothing should live in your abusive care.
I'm really enjoying this guy so far. Turning my tank into African tank. The Knifefish is doing well now. He was swimming all weird. I think the trip stressed him out really bad.
My malawa shrimp should be getting delivered soon. But I'm at the office and won't be there to get them until this evening. Should have picked my remote days better.
Luckily my bros are at home to rescue the package from below-freezing temps.
Most articles for fish though, are made by people who dream of getting stores, and research everything. Several are written by biologists, like Roy Caldwell has some awesome articles on mantis shrimp captivity.
Sometimes the articles are written by people who know their shit. And if you know your stuff, you can fact check it on your own. Brush up on microbiology, the krebs cycle, basic ecology, you'll be set. This is micro-macro ecology. In reefs, you always see micro-life in good conditions. In freshwater too, but people are more rough with freshwater fish. And the inverts of that water are killed with chlorine.
Really this is a hobby, not science, and people running a buisiness are likely trying to sell stuff. Not to say that they don't have good stuff. But to sell things is why they are less reliable for care info. I bet they sell goldfish in bowls, which is not proper care, they sell fish that get massive to home hobbiest. and that's why home hobbyist is getting revenge with information.
Bettas are tropical, nemo's are trans, corals are poison, and if you meet us, we'll give you plants. (not my fish, I can't afford them.)
Ok, so I'm trying to figure out what plants I wanna use in my 14 gallon planted shrimp tank. I was thinking a nice carpet of hairgrass with a small patch of pogostemon helferi. Was gonna have alternanthera reineckii as a midground plant with some dwarf rotala and cyperus helferi in the back.
In your opinion, what are the coolest live bearing fish?
Platies, mollies, or guppies?
Pic is of my two male painted platies
The other two anons are right, the ones you didn't mention. Swordtails are baisically mollies but more active, endlers are guppies but not so inbred that they can't survive the commute home.
I don't remember the book mentioning this. It also has anecdotes regarding how plants did shitty in tank A and did well in tank B inexplicably.
In my case, my hygrophila died out despite previously being the weediest plant in my tank at one point. It went from being the only plant that was doing well to the only plant that was doing terribly. It just...stopped growing. This was also after I started EI dosing, so nutrients should have been abundant.
Although if you have any resources or knowledge on allelopathy I'm all ears.
>smallest fish in North America.
>can easily keep a colony in 10g aquarium.
>easy to breed, but don't produce giant batches of fry like other livebearers
>can survive in room temperature water just fine.
>drift around the tank looking adorable.
Literally the perfect fish and they're illegal to keep in my state.
>betta keeps following around corys and attempting to bottom feed (occasionally grabs stuff then just spits it out) like he's schooling with them
If you weren't hard wired to kill on sight I promise I'd get you friends that were less retarded.
>teeny tiny fish smaller than the tip of my finger
>IT NEEDS SIX GAGILLION GALLONS!!!!
Jesus fucking christ, not every fish is related to wild carp, the way goldfish are. Nor are they bettas trapped in a fucking cup.
Now that's just going too far. You can hate a fellow anon all you want, but wishing harm on an innocent creature is just plain sadistic.
What the hell has anon's FISH ever done to you? You, anon, are the pathetic mongloid.
Where the hell did I even remotely imply that I keep either goldfish or bettas in cups/bowls?
Now quit being an idiot and wishing death on other people's pets, I'm starting to wonder if the reason why you are so mad is because you are jealous that everybody else has better tanks/cooler fish than you.
Saw this today on facebook.
If I had the space Id probably take it off her hands
I'd get rid of the oscars, pleco, and parrots.
Fuck all of you.
Mollies are cute and have personalty
What are peoples opinions on traditional thai betta breeding
I guess I take living in the South for granted then. I feed the badis by keeping a bucket outside and giving him mosquito larvae. He also eats stray shrimplets but not enough to stop the colony from growing. No idea why Clover turns my pictures sideways.
There is, but no store in the US wants to invest in a barracks.
same anon here
i had a similar experience with hygrophila, except i increased my lighting. everything else in my tank loved it while the hygrophila withered away to nothing over about a week
i had the water wisteria variety. maybe it just dislikes changes
True. I bought one after two months because he wasn't selling because everyone said he was ugly. I mean he is ugly but in a cute way. Now he's living it up in a 55 gallon and has his own territory that even my bigger fish won't come near.
Best I could get right now. But I think he's cute.
He's still adjusting but he's doing a lot better than he was when I got him last night.
I got my first rainbow shark (albino) recently, and I love it. At what age do they start getting aggressive, though? So far, all it really seems to do is hang out with other fish. It's less than two inches long.
Nice. I'm trying to get him a good home since he's basically trying to kill everything in my tank. So far 3 replies saying there kids betta just died so they want him to replace it.
Man, introducing some ladies into the tank has had a profound effect on my Bolivian ram's coloration.
This meme is sort of hit and miss desu, sometimes they're indestructible for absolutely no reason in shitty conditions but the moment you begin to pamper them they start dropping like flies
OK so I've had a 2ft tank setup for maybe a year with ADA aquasoil. It's just got shrimp and some tetras in it.
I got the tank second hand so the glass is really cheap and has a bad colour cast.
Not only that but the shrimp are grinding the shit out of the aquasoil meaning the filters are constantly full of red dirt.
I've bought a new glass tank and some eco complete that I want to transfer my tank into.
There's a heap of pond snails in there as well. My question is, if I treat the old tank (driftwood/etc) with snail killer, would I be able to put the driftwood into my new tank or will that affect the shrimp?
and if so, for how long? Could I sell my current shrimp, treat the driftwood/plants then in a few months after it's been in the new tank get more shrimp?
>Take wood, rocks, and or any non living decoration out, boil the shit out of it.
>Put it in new tank along with the soil/water/any brand new plants.
>Once fully cycled, transfer fish and shrimp to new tank.
>Medicate the fuck out of old tank.
>Once all snails are dead, do frequent water changes to get rid of any medication still floating around.
>Salt dip old plants before adding to new tank.
How many RCS should I put in a well filtered 10 gallon with a betta
I hope to have a pretty large amount of them in there. Tired of just keeping solo bettas, bettas aren't exactly high energy pets
I wish I could put amano shrimp but larger shrimp are banned after my amano escaped the tank and ran across the fucking room. scared my girlfriend half to death.
btw heres my new betta. first crowntail and first metallic
have always been worried about their fins getting snagged but i think im an advanced enough betta keeper now to have one
There is a high chance your betta will eat them. If people really want to keep cherry shrimp with a betta, they should establish the tank with a colony of them before getting the fish
Introducing new stuff in your lone betta fish tank can go wrong, even more so with potential tasty shrimp snacks
I work nights, so I'm usually on here all night long...
What do you guys think of my tank?
I think I'm gonna remove the plants once I find cooler ones because amazon swords crypts and a moss ball just seems uninteresting plus I wanna have an amazon theme
>start cycling my 14g biocube
>decide to get some super cheap fish and feeder shrimp to help it cycle
>wake up after day one and one fish and two shrimp have disappeared
>find the fish in the compartment above the bio balls
>shrimp probably stuck in the intake by the carbon filter
Good thing I decided to add some livestock before putting my RCS and micro rasboras in the tank. How should I go about blocking the intakes without fucking everything up? I was thinking about wedging some filter floss in between the carbon filter and intake. Also, the pump seems to be creating an area of high flow at the top. Will that bother my rasboras too much?
The filterfloss idea will work, but you'll have to change out the floss like every couple days, unless you get really rough mesh stuff, which i'd recommend. The high flow area will be fine. I've never seen a fish like that have to much water flow.
Took some sweet photos of my plants, they're pearling like crazy.
Sorry for the horrible focus.
Constipation? I can't tell. Never dealt with it. This image was taken a few days ago and has gotten smaller.
>Anyone ever fed their fry live brine shrimp cysts?
Yes, but decapsulated
>Will it kill them?
It can if the cysts still have the shells
>Will they hatch? The salinity is only 6 ppt
No, now fuck off
I dunno, I have seen bettas react and not react to shrimp. This betta is pretty inquisitive and checks everything out so i think there's a high likelihood he might eat them. I gotta try though, betta only 10g is just too boring.
How do you stop RCS from getting sucked into the intake of an aquaclear filter? Can I just cut a circle into a big block of foam and basically put a foam shield around the intake
Depends, is the foam made of aquarium safe materials? If so, then yes! Hell, the foam/sponge material you use will even come to house beneficial bacteria that can help keep the ammonia cycle of your tank balanced and healthy.
im talking about using the same foam insert that goes into the aquaclear as the mechanical filtration.
i just wonder if it wouldn't hurt the pump motor to be restricted like that etc. but the aquaclear 20 is really powerful in a 10 gallon, it'd def suck up their little shrimp asses.
Then it's definitely A-OK. The foam is porus material, the water will be able to move through it just fine. If anything, it will probably help it function better, because it will block all of the larger debri from getting inside and gunking shit up.
Fluval makes a prefilter sponge specifically for the Aquaclear 20. You'll have to rinse it out once week or so, but it works really well.
When rinsing it out, don't use tap water and NEVER use any kind of cleaner, like soap or bleach.
Just squeeze it out gently in old water you removed from the tank during a water change.
recently got this crowntail betta. does he look healthy? i'm new to fish.
also he's currently in a filtered 1 gallon tank but i'll be upgrading to a 5 gallon in a few weeks
I just saw some bug-like creatures in my father's fish tank, couldn't snap a pic before they hid in the plants. They were tiny, clear, and looked like a mix between a flea and a shrimp. They came out when I fed his fish. Neither of us have any idea of what they are. They don't look like daphnia.
Thinking of getting a 20 long for a betta I've had a few years, I have a canister filter rated for 55g but I'm not sure if that would be too much current for a betta or should I just get a canister rated for a 20 since the tank will be heavily planted with a very light bioload.
Also anyone have any ideas for interesting low tech plants? Haven't decided if I want another tank with co2 but I prolly won't.
Get a cheap net and cut out the net and zip tie it over the intake.
Had to do this for my shrimp tank and my only regret is not looking for a black net.
Also this catches allot of plant matter and stuff that I notice allot of the shrimp graze on it.
>implying one gallon torture chamber
Don't you know bettas live in 6 oz mud puddles 9 months a year and live on plant roots, in fact large areas scare bettas
It is, which just goes to show you that goldfish are just like smaller koi, and belong in ponds.
Its features were listed with "easy water changes" and "durability", which is fair enough. Pretty similar to what the Chinese were keeping their goldfish in when they first bred them.
That filter is fine, just take some aquarium safe sponge/foam and cut it to size then cram it into both the intake as well as the out take. And if the current is still too strong then direct the out take against one wall of the aquarium.
getting a 40br set up soon and was thinking of giving it a sump with a small display tank built in. This is my current idea, need some suggestions though on what pump I should use and what overflow would be best.
how 2 get rid of cyano bacteria lads? It got introduced from some driftwood i bought from LFS and ive since thrown that.
Tank is a 350 litre with no fish in (was just setting up when i noticed the cyano) still got some plants but not many.
im reluctant to to antibiotics course because the tank is cycled.
Have tried hydrogen peroxide
Are you sure it's not just diatoms since the tank is so new? The only way to truly deal with cyano is to find the source of the problem and eliminate it. Everything else is basically just a crappy bandage. Dosing chemicals is bad for the overall health of your tank, so don't do that unless you absolutely have to. My guess, is that your tank is very new and your just getting an initial bloom because you added the wood before your tank was cycled, and just added lots of extra phosphates and nutes. i would just let it run it's course. Get some plants (top floating plants is best), and let nature take care of the rest. Ofcourse you can manually remove as much as possible, that definitely helps.
Y'all niggas need to stop the pissing contests
and start posting pictures.
I transferred my betta in a large cup (0.25gal) for like 24 hours and somehow his fins got damaged. Ammonia measured at ~0.25ppm in his cup, but I know that the ammonia levels were way higher in the cup that I bought him in, and his fins were fine at purchase. Maybe he nipped his own fins, but, again, it was only a couple of weeks ago that his home was a much smaller cup.
I'm hoping they grow back. Last betta I had, seemed like there were tears in his fin that never healed 100%.
I think light starvation works.
Seems like so much shit can tare up a bettas fins, they'll get stressed and nip themselves, plastic plants, sharp rocks, hell I even had a betta that tore up his fins on some driftwood because of here he'd rest.
I'm not exactly worried, everything in my tank is faster than the crayfish...
My 2 amanos tend to stay hidden up in the plants anyway. The only things that even get close to them are my cories; I've seen them get pinched a couple times now. I guess they'll learn eventually.
Why buy a juwel 450? Those are damn expensive. Check your local craigslist posting, you'll find large 120 gallon tanks there all the time. Either way, that should be good. Piranhas can be hard to keep though, I don't know many tanks that didn't end up with just 1-2 scarred piranhas, so I would try to add lots of hiding places/way to break line of sight.
I just put one of those on my Fluval 206 intake like 5 minutes ago...