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If you have answers, please help by responding to the unanswered posts.
Most polyps are photosynthetic and require light to survive. How much light is dependant on the polyp, so please answer darb2's questions and we can help more.
Most corals use availble energy for life supporting purposes, if there is energy left over they use it to repair damage, and if there is still energy left over they use it for growig/expanding...so if it's multyping it's probably doing pretty good as you mentioned already.