Also, I have 4 pikes in this tank (55g) right now. This pair of alta/anthurus, a venezuelan pike, and the big lepidota. They all get along GREAT. There hasn't been any inter-pike aggression whatsoever. It probably helps (guessing) that they are all the same size right now. I'm hoping to move the apparent female lepidota into this tank soon as well, to see how she gets along with the male lepidota.