kind of hard to answer here. My recommendation is to pick up Eric Borneman's Aquarium Corals book. AWESOME book, and goes into a good bit of detail on all the common (and some uncommon) species of corals. Natural location, reproduction methods, care, requirements, etc.
I think this would give you a LOT more detail on each coral's method of reproduction as well as a lot of other good information necessary to get your tank in a condition for that to occur.
here's a link to all the books TRT recommends. This book is the 2nd one:
http://www.thereeftank.com/books/