I have had this ORA snowflake clown for about a 3 weeks now. I noticed today that one of his side fins looks to be fraying. In my tank I have a purple dottyback, bi-color blenny, Darwin clown. The dawin and dottyback were a bit rough on him for the first 2 hours, but ever since everybody has been getting along well. The female Darwin and snowflake have been getting along and hanging out. He doesn't seem stressed and is eating well. I put some garlic extract in with the food today. Is there anything I can do to prevent disease if he is fighting something? or is it most likely just stress related?