I asked this exact same question a while back.
was told not really a mated pair unless they lay eggs.
lo and behold, they did (on their own), and been doing it every year ever since. I don't feed them anything other than formula one pellets.
as to try to hatch them, one year, I attempted that. was not successful. It is like 10x harder than how it looks.
http://www.reefcentral.com/forums/sh....php?t=1896515