have this arowana that has a bend in his back wasnt sure what it was read that it might be broken back and that putting a powerhead in the tank sometimes helps them so i did that but doesnt seem to be doing anything for it so not sure if that is the issue.... other than that he seems fine he eats very well and doesnt have any other issues i can see..... the tank he is in is a 300 gallon 6 x 3 foot print and water conditions seem fine as far as ammonia nitrite and nitrate