I hope it isn't the fur coat thing, that would make all the others susceptible to it as well! It doesn't look fuzzy just gray... You can see scales but they're all gray! At first it looked raw and pinkish gray. And the parts turning this way are literally dying off, he can't exactly move them. I can't watch him anymore so my sister's keeping an eye on him. It's so weird and scary! Poor guy, I got him accidently thinking he was female, he got a chance to get out of that hellhole just for this?

At least he will go peacefully instead of having to swim away from other fish constantly...