ID Black dots on yellow tang?

[ScubaGirl]

His fins looked pretty tattered when we got him. We are the third owner of this tank so we don't fully know the history of the fish/live rock, etc. We were told that the first owner had it (and the fish) for 6 years, second owner for a couple of months and then we've had it for a week. Two fish have now died in the last 3 weeks but the water is testing fine. We don't have a qt set up yet so that may have made the difference here. We were doing the garlic soaked food for the week we've owned it. Hard to say. I've seen worse cases of ick and the fish survived.

We really enjoyed the yellow tang so it was a bit heart breaking, especially being Christmas and all. We're going to let it settle down a bit and see if we lose anything else before replacing him.