I don't know if a couple of months is long enough - I added a 4" Sohal 6 months ago. He settled in fine and was getting along marvelously - no agression.

About 6 weeks ago, he figured out that he should be the "boss", and now has decided that my Foxface is his competion. He's not too bad - mostly just a little chasing, but at feeding time, he does his best to ensure that the Foxface doesn't get supper. I suspect that one of them is going to have to go

The Sohal is a beautiful fish, but don't bank on a leopard changing his spots...