I have button polyps and they are crowded onto a large rock. I removed rock and took some polyps off and put on rock on a frag plug. They look great. New polyps grew on original rock I fragged from. My question is two-fold: 1, do I need to do something with the ones on frag plug; 2, should I continue to thin out the original colony as they overcrowd the rock they are on? Thanks, Ann Marie