Hi guys, yesterday I added the finishing touches to my CUC. Some Trochus snails and a couple emerald crabs. I noticed one of the snails was on my zoa rock last night (hopefully grazing algae or something). Came home from work and noticed this reddish powdery slime kinda stuff on some of the colony. What is it? How worried should I be? How do I get rid of it? Did the snail have anything to do with it? Should I chuck the whole rock??