he was doing that alot the last week or so
atleast he's got a tank to himself,i think he may just need to be left alone for a while(no other fish)and he'll be ok.i glad you got him coz my friend was planning on putting him w/a real nasty con and jack(both are smaller)but that don't make it better.
he's a great fish,when i would do water changes and vac he would swim all around and thru my hand-sometimes i'd take some krill into the tank and he'd just swim there and take chunks of krill out of my fingers.
p.s he will bite if you move to fast lol.
well if possible keep me posted and thanks for taking him.
sammy