Yesterday I picked up my first oscar (tank situation fine for now(55 G) and in the future[210 G]), I've done all my research so I thought I could handle one, but mine has spent all his time terrorizing my other fish. He's either trying to get my attention or he's chasing my other fish. Are all oscar's this agressive, or did I just get a bad one? Will his attitude change? I'm already ready to return him if this continues 
