I would take the cbs out and add some cleaner shrimps, fire shrimps and some kind of crabs, they add lots of colour to the tank, they re attractive, as fish, i would one more bangaii cardinal, 2 more chromis, one more tomato (which is smaller or bigger than yurs) and last, i would add one or two pair of gobies, shrimp gobies w/ a pistol shrimp can be good, if u ve sps corals, clown gobies are fine, there are hundereds of gobies, choose one
Good Luck