best would be to do a sump 20g ish and about 50-75 lbs of lr. crushed coral base really does nothing for you, live sand helps with nitrification, argonite helps as a buffer, but CC just needs to be cleaned constantly. BUT, what i would do if i were you is add 75lbs of LR, maybe put another biowheel on it and a powerhead to make sure you dont have any dead spots in the water flow and do 2 clowns (anything but maroons), a dwarf angel, a longnose hawk, a diamond goby, a midas blenny and maybe 3 bangaii cardinals (if you like them). but only if you have the added filtration and make sure to stay ontop of your water changes....What kind of lights do you have,, were you thinking of a anemone?