At this point you don't need to worry about it. With the coral load being mostly frags, Ca and friends should maintain sufficient levels between water changes. Those numbers are low though, so first verify with other kits to make sure your kits are right, then dose up with 2 part to get to the levels you want. RC should be close or above 400ppm Ca, above 7dKh alk. Mg I would expect in the 1100 range. Those numbers are below what Instant Ocean claims is their minimum levels and RC should be higher.
Currently my Ca reactor is sitting in my kitchen, no rush to hook it up with a tank full of frags. Also, I use mine to more maintain levels rather than boost levels.
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Brad
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