Hello to all.I'm new to this board. I just got a Chevron tang to add to my 40 gallon. I have a marroon clown,cuban hogfish and flame angel. It is a semi reef; some mushrooms,polops and star polops. I have a protein skimmer and uv filter.As weel as wet/dry filtration.My chevron was in quarantine for two weeks. During the entire time he had a small irregular blemish on one pectoral fin. It got no bigger,no smaller, for two weeks.I finally put him in my main tank,thinking he'd be etter off there. Now I'm worried. What could that "blemish" be? HE's eating spirulina algae and mysis shrimp(with garlic),and he's grazing on the live rock. IS he ok? Any one who has experience with chevrons please comment. Thanks so much.