Well, them mine is right on track. He's about a year old and 5 1/2 inches. A freidn of mine gave me the tank and him about 3 or 4 weeks ago, and it's only a 20 gal......but he is a whole lot better off with me in his old tank than her. She hadn't cleaned the thing in about a year, and had just a regular filter on it. I do weekly water changes (25%), and I bought a Emperor 280 biowheel for the tank since I know just him alone is a big waste producer. He also was alone, so I got some snails and another small pink kisser for company.
I've got 4 clowns....the biggest is about 2 1/2", and the smallest is about 1/2" to 3/4" long. I never saw them get hostile with my snails I had in there.......all 4 of them would swim up next to one on the glass, and do circles around it and go back to their hidey hole. The never tried to get it off the glass or anything like that.