I'd actually go for a tang from the bristletooth family. They crap a lot, and they definitely pull their weight in terms of cleaning. You could do anything from a kole to a chevron, or even a leutenant tang. Most of the rabbitfish, as recommended, are great too.
If you are set on going fish only there is a product, its a Mark Weiss item, called SPS grow or something, it comes in an oval dark blue container with green writing and a white twist off lid. The product is actually dried out fish crap.
**edit**
the product is called SPS Coral Grow.
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