Well, nothing I find online looks like this though. Searched white stringy poop, it shows only something semi-transparent white, but this looks exactly like thread. And it only was at the start, now the male is pooping normal after that segment.Yep sounds like a parasite to memaybe came in with some of your new fish
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I've never treated for them before so all I'd be doing is a google search so not much better than you can do lol. I hear good things about eSHa 2000 though.
Some say garlic flake would work if it's some kind of worm, but can normal garlic work too if I can't find that?
It looks like a piece of silvery, shiny white string. I took it out of the water with a net.