No ....corals can survive and be brown. Its usually a sign of too much nutrients or not enough light. They will do much better though when you clear up these issues ie grow faster and be more colorful.
Very nice!! I just picked up a large colony myself hoping it will turn out like that its a nice big stag it has very little color but the polyps are green except the very tip polyp is vibrant blue....ill try and get a now pic and then post again when it colors up..
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