Hi i have a 5ft by 2.5ft by 2ft tank at home and i currently house a oscar and an arowana. I raised both of them since they were babies. They were originally in my 3ft tank and used to have small fights when they were young. But recently in the 5ft tank , things have took a turn for the worse. Arowana is extremely dominant and aggressive. My oscar gets bashed at least twice a day and all the water splashes out from my tank. Oscsr stays only at the bottom left of the tank. Visible wounds are seen on oscar.But has no loss of apetitide