Our 180G has the same problem with corraline but then again we have 12 clams so I think tony might be right, your corals are pulling so much or the calcium/Alk that it's not leaving much for anything else....plus coraline is a type of algea so I would asume it needs nitrates and phosphates to feed off of!!!
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500G Mixed Reef

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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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