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Instead of adding a fixed amount, you need to use a calibrated refractometer to measure after adding and mixing. Natural sea water averages 35ppt, so I would aim for that. Get a good refractometer and it will save you a lot of issues in the future.
K guys thanks I made it a bit low but now I have recommended amount for softy/Lps which is what most of my tank will be thanks. 1.023 after adding it to the tank.