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In theory, higher alkalinity levels will encourage more growth, up to the point that the corals are limited by food or light. I think 9.5 dKH is high enough in practice. Some tanks seem to have coral problems if the level gets much above 8 dKH, although that seems to be due to carbon dosing. I'd try 9.5 dKH and see how it goes.
Calcium at 400-450 ppm should be fine. I don't see any reason to go higher.
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Jonathan Bertoni
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