Nice start! I have had a maroon clown and a perc living together for about well since I started my nano maybe almost a year ago? Can't remember, anyway yes the maroon clowns do get big but they aren't that bad except when I am cleaning the tank it hates my hands anywhere near its anemone. It will bite me, spit gravel and algea, and even headbutt my hand! Kinda funny, but when they get big they actually hurt.