The lion is about 3.5in. and too small (i think) to eat any of the clowns, besides it gets fed ghost shrimp and/or feeder guppies 3 times a week, plus it has learned to eat frozen foods. The coral beauty and the butterfly have never had any problems as roomates and don't bother each other or any of the corals. my only concern is the lunar wrasse, it was kind of an impulse purchase, and I knew it gets pretty big, but it looked so awesome in the display tank I had to get it! :-D Otherwise no mayor problems.