I just got back from vacation to find one of my glowlight danios swimming on his side--he looks normal otherwise, and will eat, but as he moves he turns, like a corkscrew. Obviously something's badly wrong, but what? Is there anything I can do for him? Is this likely to be an injury, or something that could infect my other fish? (I can't treat the tank, b/c I have shrimp, but I could move him, or everyone, to a QT and dose them w/ something). Everyone else looks fine. (Tank has 6 glowlight danios, 4? otos, 12+ red cherry shrimp, lots of ramshorn and malaysian trumpet snails. params this morning, 0 ammonia, 0 nitrites, nitrates 10. temp was a little high yesterday--got to 85 before I turned the AC on)
Any thoughts? I guess I'm going to have to put the little guy down, but I hate to do it...
Thanks,
Anne