Hi Guys, I have attached a (bad) picture of a coral in my tank and have forgotton its name. I am new to the hobby and have just got my head around water quality and parraneters (a bit anywhay) But I know very little about coral growth at all. Is this coral growing? each individual polyp has a yellow center it seems lately there are tiny bits of yelow showing between the other polyps some only the size if a grain of sand. Is this how this type of corals grow/divide? am I growing them or killing them?