what happens when you run out of space on a rock for the coral/polyps growing on it? i bough a large rock covered in polyps less than a month ago, and now there really isnt any room left on the rock for these guys to grow. are they gonna kill eachother, or move or something? what about breaking the rock into pieces (sounds dangerous to me)? the larger polyps are about silver dollar size, the smaller the size of a dime. here's a pic