What is a frag?
A frag is just like a plant cutting. It is a piece of coral which has been broken off or cut from a larger piece of coral to grow into a large coral all over again. It isn't a new coral to be exact but rather an exact copy of the original coral from which the frag came. The polyps of the coral will clone themselves and over time will grow into a copy of the original. Fragging corals is a great way to keep on top of corals which are getting too big and also makes for a cost effective way of adding corals to your reef because a frag will always be less expensive than buying the original larger coral. You can get coral frags of SPS, LPS and Soft Corals.
There are frags on the RnC website which can be found at the link below;
And if you want to read more information about frags, the pros and cons, then follow the link below to the Frags 101 blog post;