So We've had this clown loach for years.Over 13, I'm pretty sure. I think we originally had 5, and they dwindled down to just this one. I think the last one just died earlier this year-jumped out of the tank into a cat litter box. Anyway, its the only fish we've got, and frankly, we're just waiting for him to finally die so we can get rid of this tank, but we don't want to just up and kill him or flush him or whatever. Being a bottom feeder, he's actually learned to feed from the top, and in the mornings before being fed, will hang out at the top of the tank, doing his little clicking/sucking thing they do. Well, now he does that on and off all day. coul there maybe not be enough oxygen for him? We've got one of those bio-wheel filters, and there's lots of surface movement. Or maybe he's lonely? Or since he's so big (8+ inches?) he's just always hungry? we feed him shrimp pellets, and he doesn't nibble on them like I've seen others do-he swallows them whole. I was just reading they should be kept in groups, but I don't want to get more to have to wait for *those* to die, and anytime we add any other kind of fish to the tank, it just dies, so we haven't tried in years, but I feel bad if he's lonely.