Palmas are hiders. Pretty much just sit and or hide. Not sure on retros i don't have one.....yet. Butts are the same hide all day. Polli, sens, dels out most of the time and active.I took the ornates back. It was getting painful watching the big one sneak up on the little one, give it a nip and then blindly chase it through the tank.
I was able to find three palmas that are all the same size at about 6". I put them in the tank yesterday and they've barely moved. I'm hoping they get a bit more active.
I may also be able to get a few WC retropinnis next weekend.