honestly I don't believe it's worth it. The risk of it eating corals, and worse, the risk of the fish dying are a little too high. I say unless it is a very large established system, leave them in the ocean. I suggest using peppermint shrimp for aptasia or berghia nudi's.
If your system can in fact support a CB, I would suggest QT'ing it and training it to eat aptasia by introducing it as a main food source.