I recently got a coral beauty and added it to my tank with 2 small damsels and a hawkfish. After a day a noticed the next morning that my coral beauty had a single white spot on its left side by its tail. Today I notice that he is flashing against the live rock. Not a lot but is still doing it. Could it be ich? And what should I do? It’s a 60 gallon cube with fish only and has live rock and live sand.