leopard ctenopomas for sure^^^ also elephant nose should be fine. my lfs has senegals in with elephant noses and clown loaches. you could try some SD's (silver dollars) they would be fine and would school around the tank.
No, they weren't intended as feeders, that's why I'm asking if they would be okay (safe).
I don't know which kind of rainbow fish you're referring to, rainbow whats? And what does SD stand for please?
Thanks for your reply,
Cat