What's your fascination with them, I currently have a wartskin and have kept painted as well. I think to fully enjoy them they are best kept in a species tank. They aren't that active, they are ambush predators that just kind of wait for food to come to them. As far as what can go with them; they can actually eat a fish as large as themselves, and will. It's not the size of their mouth, it's the size of their body. So any fish that are larger than them and won't pick on them.