It likes, no, it really needs fresh algae. In the absence of a good growth of tasty Macroalgae, it has turned to eating coral for the Zooxanthellae algae in coral tissue. One thing is that it needs some training. Just like other animals, fish can be conditioned to stop certain behaviors. Look for the thread about it, listed in the Reefkeeping Tips linked below.
The article about fish training also describes how to help prevent this by growing in the tank beforehand or later adding some Caulerpa for the Tang or Rabbitfish to graze on. Dried seaweed/Nori is not adequate, IMO. Fresh rinsed Romaine and Green-leaf Lettuce are also good for Tangs. Place it on the clip with a small piece of Nori and the fish will soon learn to eat it.
If one of the methods of PO4 removal is being used, the occasional temporary discontinuance of that use will allow soft algae growth on the LR to feed the Tang (this is my prime recommendation for soft surface algae loving Angelfish). If a Refugium is present, pull Macroalgae out to feed the Tang. Chaetomorpha is not their favorite, but they can eat it. If you don't have any Caulerpa in the Refugium, come see me for some, free.
Aloha,
Mark
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