I have a Dwarf Lion with diamond Goby, tank raised Maroon Clown, Atlantic Pygmy Angel, and a Valentini Puffer. The Lion is a gentle giant, and is almost about 3.5/4" long. I got him when he was pretty small. He doesnt bother anyone, and even ignores Doink the Clown when he tries to back into him in order to get him out of "his spot". The only problems I have had are with the Angel beating the hell out of a Six Line which died less than a day after I got it, because the Angel did not want it anywhere in the rock. And my Puffer sometimes nips my Clown's fins. All of my other fish are also "mid-sized", meaning they are all about half their full grown size, the Maroon Clown is only about 2" though. I think those fish you want to have would be fine if you introduced a small Lion like I did. It might gobble up the Damsels though when it gets full grown, but you never can tell.