Changed food to Omega One but the fish wouldn't eat it. Also talked to another pet store(local and doesn't even carry salt water fish). Turns out my water is lacking certain elements that both the tang, and my angelfish require. Two spots had just formed on my angelfish on Friday, I purchased this stuff "Mydor" which adds trace elements to the water. Today, my tang looks darker in the face, back to the way it should. It appears to be getting better. The angelfish still has the two spots, but I expect them to disappear within 4 to 6 weeks(healing time for marine head and lateral line erosion, or MHLLE). Should anyone else have a tang or angelfish that develops "blank" spots in the color of the skin, I strongly recommend you find a bottle of this stuff that puts trace elements back into the water. If things change for the worse or completely heal, I will report back in this thread.
P.*. Caught it while it was out.