I am considering adding several (3?) smaller schooling fish to my 55 with the hopes of adding some additional color and activity to the environment. I currently have 2 Clarkiis, 1 Fire Goby and 1 Yellow Tang (sadly my 3/4" Blue Hippo disappeared after 4 days). Any suggestions? I've read Green Chromis do well. I also have read that the Clarkiis will not take kindly to any additional damsels being added since they, too, are basically damsels.