He's been like this for the past 2 days..he got a little of his fin torn off in the front, and I put him into a 10 gallon hospital tank and he's been swiming really odd..like his tail fin would sometimes slope down or his head will slope down..and he's just been going nuts, though he eats normally..I feed him freeze dried krill and freeze dried bloodworms, he is about 4 inches..and was housed in a 55 gallon with a gold clown knife(8 inches) and a gold datnoid (1 1/2 inch)..I've only seen agression coming from the little dat..never from the gold ck..the ck wouldn't even hurt a bumblee goby(I know, since i've kept him with some)..well I would really like to know whats wrong or if it's perfectly normal. Much thanks.