They're relatively peaceful compared to say, mbuna. Males can be rough on each other and females.
They're easy to keep and breed. I sold my last ones about a year or so ago.
There's another variety that's floating around the hobby called Ps. multicolor victoriae (AKA incorrectly Ps. philander dispersus) that's yellow, smaller and more peaceful. Here's a bad picture of them
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It's funny how these things go in phases. When we had a couple of people in the club breeding both of these, we couldn't get $1 a bag for them. So people - including me - quit keeping them in the belief that others would take over (and to make room for other fish). And no one did so they're hard to find at the moment!
It's a shame that showing fish requires keeping them isolated...
Matt