It depends on the alk of the salt your using and what % of water change as well. Consult this reef calculator http://reef.diesyst.com/flashcalc/flashcalc.html and use plain baking soda mixed with a little r/o water to raise the alk to your desired level. I would also check calc and magnesium to make sure the respective levels are in line and I suspect they probably are not.
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