I've been looking for a fish that would be "ideal" to add to my mantis tank. It is only a 12g eclipse so there isn't much room. I keep him well fed so I dont think he'll kill just to kill (although i've been known to be wrong). I've currently got a decorator crab in there with him that he hasn't harmed in 2 weeks. Even when i didn't feed him for 4 days. Don't know if he doesn't see him or doesn't know what to make of him since he's covered in hair algae, sponges, and a whole bunch of different stuff. Does anyone have any suggestions on a possible top of the tank level fish i might add. I've heard a couple people suggest a damsel since they are so fast.