Frags have many advantages over wild caught stoney corals. Not only are frags much more hardy than wild caught, frags also have less of an impact on our fragile environment. In addition to hard corals, soft corals can also be fragmented. This process is surprisingly easy. Unlike hard corals, I would not recommend just breaking a piece off and placing it in another part of the aquarium.
Soft corals take a little more care.
For branchy pieces of soft coral such as Sinularia sp. Due to the fact that these branches are going to be virtually buoyant once cut, you can use the rubber band to attach the cutting to a small piece of rock. The cutting will attach to the rock within the first couple of weeks. By doing so, you can propagate most corals in your aquarium, ultimately giving your aquarium a more natural look. This natural look comes from both diversity of sizes and strong growth of corals.