I've been away from FL for a while, mostly because I've been going through a massive fish die-off with no obvious reason why. I had an issue with nitrates in my tap water for a long time, but that seems to have subsided. For a while now, one tank in particular has been continuing to suffer die-offs as things have stabilized elsewhere. I've long suspected myco but I'm afraid I've got my confirmation in the form of a glowlight tetra with a crooked spine. Pictures and a video below: https://www.youtube.com/watch?v=8ueqCmPAwiA&feature=youtu.be If it is myco, how trashed am I? I've managed to make it this far in fishkeeping without a myco outbreak, but that's been my primary grow-out tank for plants. No joke, of my nine tanks, only two are theoretically not infected by virtue of not having any plants or fish moved back and forth, but even those two tanks have used the same siphon that has gone into tanks which definitely did have plants moved into them. My fear is that the myco's been there for an unknown amount of time, but the nitrate issue stressed the fish in that particular tank (and possibly one other where a pair of gouramis died, though they died during a period of extremely high nitrates and little I could do about it) to the point that the myco became active. If it is myco, the only humane solution would seem to be euthanizing everything in the 20 that is showing definite symptoms (so basically, 10 glowlights, four surviving flame tetras, one surviving cory and Doomsday, my DG buddy) and effectively quarantining every other tank I own for as long as the fish are alive. Poo, check that. My 10g sparkling gourami/pygmy cory tank is infected by way of some water sprite that was moved over from an infected 10. So basically, my 2g RCS tank is probably not infected, and that's it. If it is myco, I'm done with fish. Ever since the floods last September, keeping these things alive and healthy has been challenge after challenge, and I'm sick of seeing people do less than the bare minimum for comically-overstocked tanks have no issues while I've spent all kinds of time and money on these fish since those floods, and I'm euthanizing a couple of fish a week as a result.