Healthy or not??

[Haloreef]

I do not know about the statement that they are too fat. Having dove with Tangs on quite a few differnt dives I have seen alot of fat Tangs. Every time I have dove with them they swim a short distance graze for a few seconds then move on and repeat. The same behavior happens in my tank. Swimming in the ocean swimming in a tank from lights on to lights off. I know the currents in the ocean are quite a bit different but my wave box and power heads do a pretty good job of moving the water around. Having said that I have no idea if you are over feeding. Or what you are feeding for that matter.
Any pictures of the porkers?