Its on its way, mine is green because my system is not yet matured and past the algae stage. I have all the corals due to unfortunate circumstances that forced me to put them in before I was ready. I have some red algae starting now which is expected and some pink coraline algae starting in the refuge. so far the tang is keeping the algae under control. due to the inmaturity of the system I am having to feed, so, along with that comes the need to watch water quality.