Hey everyone. Recently stocked my tank with the first 6 fish and the blue tang has two small spots on it I’ve noticed. Does this look like ich or anything I should be worried about? The fish eats great and acts normal (no scratching or rubbing) only odd thing is at night it tucks into a small crack in the rock and sleeps for a while after lights out and then comes back out and swims again after a little while. None of the other fish have any spots on them.