I have a 30"x30"x20" cube and I am looking at getting a couple resplendent anthias. My question, for the anthias gurus out there, how many would be too many for a single group in my tank? There is lots of open water and some good areas with caves in my rock structure. The only other fish I currently have is a bi-color blenny, as I am just starting to stock with fish, instead of coral. Thanks in advance.