follen;1953940; said:what arowana isit my 12" jard nearly killed an 8" oscar over night.

Very true, tank size is definately a huge factor considering they are both territorial fishrallysman;1954335; said:As previously stated, it should be ok if it's a silver or a black. If the Oscar has established dominance in the tank don't be surprised if it pushes the aro around for a while. Once it realizes it's not a threat it should get over it. Also, what size is the tank? That could make a huge difference.