One more ? for you Murph but i dont want to hi jack, when you say thats the only place coraline grows, did you have it on your rocks before your corals and inverts started using extreme amounts of calcium, i am having a problem with my coraline bleaching out and i think it is because my sps and lps corals are using all of the available calcium. is this a possiblility, For instance i have a plating monti that when i got it it was only 2"x3" now it is larger than any dinner plate i have in my house and has about 25 or 30 different "rims" and that is only one example of the growth i have seen, i also have hydnaphora, monti digi, acros, and an assortment of lps's