The tank is a 15 gallon cube. It's been running a year. Corals are doing great, thriving, growing, spreading. Only soft corals, mushrooms, cloves, toadstools, xenia. The only inhabitants are three astrea snails, 1 nassarius snail, 2 pom pom crabs, and one blue line goby. I just ordered some beautiful rock flower anemones. I plan on getting some sexy shrimp after the rfa have settled. I want to get a unique fish for the tank, and was thinking of a coral croucher goby. Would this goby eat all the crustaceans?