I have a 90 cube. In my tank are a pair of misbar clowns, watchman goby , cleaner shrimp , peppermint shrimp, 2- emerald crabs, cleaner wrasse , and a powder brown tang. I added a nem a few months back and within a couple weeks the clowns. Began hosting . At first the clowns were very protective of the nem and would chase the tang away setting up boundaries ( I should point out during this time the clowns were a little bigger than the tang) . Since this time , the tang has grown a little in girth and now I notice he always swims near the clowns and nem and bats his tail as if to taught the clowns into a fight. Should I be concerned with them coming to a full on brawl soon or will it just pass over between the tang and clowns? All fish are about 2.5”