I kept and bred them a few years ago. They're pretty quiet and peaceful fish...easily bullied by other CA cichlids.
I kept two pairs in a 2'x2'x1' tank with flowerpots, plastic plants and PVC. They bred in a 6" flowerpot and were pretty good parents.
They seem to max out at about 3-3.5"...get kid of a purple sheen when they're happy.
I traded a bunch of them to Capitol Aquarium in Sac'to (when they were open). Basically had to beg them to take them at $1 credit each...
I figure that most of the ones in the hobby (including the two pairs that I sold when I moved) have disappeared because folks tried to keep them with more aggressive CA cichlids. They'll get bullied by cons, Cryptoheros, Thoricthys, etc.
Matt