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My neighbor and I are talking about getting more corals for our tanks and I decided to read up on corals. I currently have soft corals and from what I read from corals101.com. They said that it would be best to invest in a calcium reactor. The cost would be much cheaper in the long run. I also have to clams in the tank that I know need calcium to grow. In my refug I have some cheeto and notice that they don't grow. Do they need calcium too?