I have two of these guys in a 100g - they are total pushovers. Both are around 5". Even the most mild cichlid has pushed them around in the past. They are only aggro towards eachother (one is ~.5" larger and is completely dominant). They have very clear territories in the tank, and the smaller one will get chased immediately if he comes into the driftwood area that the other one hangs out in. I have seen two of them get along before in a LFS and spend all their time swimming together, which was the result I was hoping for.
They've been on NLS pellets for so long that they seem to no longer care about live food. I've kept young fish as small as 3/4" with them and they completely ignore them. Mind don't seem to like bright light, so if I want to see them out and about a lot I have to turn on something dimmer. When they do come out to socialize though, they are very personable.
I will agree that some of them get kind of gnarly as they get older - mine are very close in size, but the bigger one is much less pretty than the smaller. Less pronounced pattern, less nice body shape, etc.