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Coral coloration is a very complicated issue. What kind of lighting are you using? Bulbs (not LED) fade over time, which can be an issue. I haven't heard that adding nutrients will reduce brown coloration, although it seems to help with colors that have faded.
Another thought would be to try a bit of GFO. If there is much phosphate flow in the system, the GFO might be able to outcompete the zooxanthellae in the coral, and reduce the browning, if Zooxanthellae growth is the issue.
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Jonathan Bertoni
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