If it has white polyps that come out at night, you might be in trouble. It might not be a photosynthetic variety. The non-photosynthetic gorgs can be extremely hard to keep because they need to be feed 2-3 times per week at night when the polyps come out, and the majority of the polyps need to get some food. In small, young tanks, it can wreak havoc on your water quality trying to keep up with it.
The photosynthetic variety, on the other hand, is very easy to keep, but often times LFS will sell this coral with little disregard to what variety it is.