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seems really odd that you have such low mg, ca, and alk. Makes me wonder if your salinity is a lot lower than you are testing. How are you testing salinity? If you are using a refractometer, did you calibrate it with calibration fluid? Before doing anything I would say take a sample to a your local fish store and have them test everything. Most do it for free.
You should be getting 400 cal, 11dkh, 1350 mag. at 1.026.
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