I like some mature pieces so I have something to watch, but I love seeing a little tiny frag grow up. Sometimes I sell the larger colony later and keep a small frag rather than just selling the frag so I can watch it grow.

When we moved to Texas, I wanted to bring all the SPS I had grown out with me, but the colonies died (my fault entirely). Only my frags survived. I was sad then, but I got to watch them grow up all over again into even larger colonies.

And I'm with Ace about watching your own baby fishies grow up. That is funner than anything.