How often are you doing water changes? I would do something different either supplement levels or change salt brands. I personally never cared for instant ocean in my reefs but more my opinion lots use it with great success. But you will want to aim for 7-12 kh 390-430 ca and 1300 mg if you can keep your levels around there you'll save/ prevent future problems. Raise them up slowly to not shock anything.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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