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Alkalinity and calcium are going to fluctuate due to the fact they are being consumed by your corals. Alkalinity is also consumed by your biological filter. Try dosing with Seachems Reef builder to raise and maintain carbonate alkalinity. You might try Liquid reactor by Kent, this is a calcium buffering system in one. Add it at night because it clouds the water for some time. Water will be clear by morning. If you want good Mag levels try Tropic Marin salt. A little more expensive then the others but worth it. Takes a little longer to dissolve because it's higher in mag then other salts.Magnesium salts take longer to dissolve then sodium salts. I gather PH is okay. Try adding some buffer to your top off water.
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