I have a mini-colony that's greenish at the base but transitions to pink/purple/red as you progress up the colony. It's in pretty high light. I have a small frag that's in lower light and that one is totally green. I recently moved tanks and in the old tank the frag was under high light and had the same coloration as the mother. After moving, the shock of transferring and lower light caused it to green out. It's been real slow to come back though.