NSW generally has a reading of 8dkh so I agree yours is on the high side. Don't forget that you should really be testing for Alk, Calcium and magnesium. All three have to be balanced and I try to shoot for natural sea water levels of all 3. The above link is a good one for things you can use to bring your alk. down or there are various online retailers including some of our sponsors that will ship additives to you for a very reasonable price (I know as I have to ship everything for my tanks given where I live)
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