Fuck. my tank has been doing so well, i've been taking better

salt bath

Parameters? Any behavioral changes?

Can't tell on my phone but mite be shit

>>2086650
I'm not a fish expert but I don't think they poop from there.

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>>2086702
except that they do

could be poop, could be a parasite

fish dick

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The white string is almost certainly poop.

This is often indicative of parasites or GI infections.

I'd skip a meal or two until the poop is gone. If you're giving him live feed, don't. Switch to pellets and reduce portion size, at least for now. [spoiler]I think my first betta died from a GI infection he got from a bloodworm that's started to go bad in the freezer. RIP Archie ;_;7[/spoiler]

Monitor for bloating and behavioral changes. If he's just a bit constipated, it might resolve on its own, but if he becomes sluggish and apathetic, that's a red flag.

If I were you, I'd google for some kind of general preventative measures that could nip an internal infection in the bud before it turns into full-blown dropsy. Like >>2085139, adding salt to the water might be an option, but I'm not sure.