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I just purchased a small yellow tang. Once in my tank I noticed it has some very small, less than a pin head, dots on it lateral fins. nothing on its body. Is there any cause for concern here?
One of the main reasons all new fish go through the <<quarantine>> process prior to adding to the main display tank. It allows for proper time to pass to observe and ensure there is no possibility of parasite or disease.
I would suggest getting a QT set up ASAP to be safe if needed. It may be ich or might be nothing but leaving it to chance will not be in the fish's best interest...