Mine wasn't in such a large reef, but it took chunks out of leathers, and ate any part of the cleanup crew it felt like. As a juvi, their colors are even seen as a "cleaner" by other fish....as an adult...they have no place in a reef..... polyps, corals, crabs, snails....it tasted it all looking for something good to eat. They would even kill their young if not for the colors. Mine even tore apart a stingray one day, and chewed through the belly of a cowfish as a juvi....trying to clean I believe, but even without trying they are pretty destructive. A 200 gallon would not be enough in my opinion if you planned on keeping it forever......they have HUGE territories in the wild....hardy fish, but destructive in my opinion.....after they change colors that is.