Lots and lots of different little ones. Frog spawn is usually a pretty fast grower, but 10 new heads from a two header in two years is excellent and above average. Definitely a great mother colony candidate. Have you tried fragging it yet, any coral that grows that well under T-5's would save a lot of other corals from death or a death like life, if frags are distributed. Just cut a couple back heads or lower heads, and then frag the heck out of them as they grow. Your tank has sounded like it is definately healthy enough to grow out frags well.