Im not really sure if i have too many fish for my tank. I do water changes about 3 times a month but im going to start doing them every week. I run carbon and no skimmer. I currently have. 2 molly millers, a sixline, fangtooth blenny, and a blue chromis in a 60g tank. All my coral are zoanthids and mushrooms. I have heard to not put 2 molly millers in the same tank but i think mine have paired up because they hang out with each other alot.