I have a pair of Percs a six line wrass and a bi-color blennie in my ten...the blennie is new, the other three i have had for a while. I do a water change once a week and watch the levels real close....I only had one of the percs for over 2 years, the other three came within this year....i am going to be upgrading to a 15 gal tank in a few months...also i am trading the sixline wrasse(thinking a rainsford goby) because he has become VERY agressive within the last month, not sure why but he has out right attacked the male clown and blennie so i think it is time for him to go. The clowns are beginning to prepare a laying site and the wrasse keeps disturbing them! i would sugest one or two fish untill your tank is nice and stable, then as long as you are willing to work for it and pick good fish you can keep a few. :happyfish