Can I keep a tank without a heater/filter? How can I do this?

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The reason I don't want to buy a heater/filter is because I already have a fish tank, (pic related, I have a bit of algae and its not completed but it's been running up well for months)
It's just that now that I have a chance to have another aquarium I'd like to if possible, but only if I can safely have some animals in it and I'll spend minimal costs. I'm fine with sticking to shrimps or a few small fish and doing often water changes, idk about heating

Basically I know the basics about keeping a tank but I dont know how I can go about doing it without equipment, if I can't I won't but any tips or advice would be appreciated

tanks get nasty after a while with no surface agitation. you can get an air pump and sponge for real cheap though.

>>2239136
I thought about that too. If I find those two things cheap would it be around $15 together? Thanks for your input

>>2239141
$15 max yeah. I find air pumps used all the time. just pick one up on amazon, some airline tubing and either an aquaclear sponge for fifty cents or a nice one for three bucks.

>>2239131
get species from your local area if you don't want a heater

>>2239131
a sponge filter or hamburger mattenfilter (google)
just need an air pump and can be easily built for under 20$ if you include the airpump.

Like many pointed out, some surface agitation would be nice, not only for oxygen, but keeps water from being too stagnant.

As for stocking: you could keep like 20+ Neocaridina shrimp (cherries, wildtypes, white pearls are the cheapest) in your 4 gallon. Breeding shouldn't be an issue.

A heater won't be necessary, since they prefer colder water water anyways, unless its too cold, like below 65ish degrees.

get some javamoss, lavarock/driftwood and some small grain substrate or straightup pool sand. Beware that most shrimp display stronger colouration on a dark substrate.

As for lighting, you could just get a cheap 6500k cfl bulb and a desklamp. Or a cheap clip-on LED, unless you wanna keep more intricate plants.

https://www.youtube.com/watch?v=cFMDt2EOm7A Lupdiesels video covers pretty much anything in terms of neocaridina care.

Could also stock it with dwarf crayfish, but these dont get along too well with shrimp.

>>2239134

THAT'S TOO MANY FISH REEEEEEEEEEEEE

>>2240439
I only have 8? I thought a general rule was 10 1 inch fish for 10 gallons with 25% weekly water changes. My water levels are good, I can't argue much about "swimming space" since I'm not an expert.

>>2240487
I think they were just going off of how it looks.

anyhow, you want to go off their adult size. I spot serpaes and platys, both of those will be larger than an inch.

>>2240547
I see, I didn't think they'd get much bigger, if it comes to that I'll try to figure something or just do water changes more often. Thanks