This is in all seriosness, I think the Zebra Danios I have are absoultley insane, granted they have no ability to inflict damage, but they quarrel more then mbuna.....But I think the Bull Shark is a pretty good call.

johno27;323881; said:I don't really consider feeding behavior as aggression. So I would would vote for any of the big cichlids. Dovii,Umbee, Midas/Devil, Jag.
These fish will brutally beat a fish to death even if they have no plans on eating it to me that is aggression