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pH up is the same thing as Baking Soda in liquid form. Get baking soda without any added perfumes or air fresheners.

When you raise the pH, do so gradually - probably over the course of a few days. Large fluctuations in pH are just as bad or maybe worse than a stable low pH (but 6.6 is definitely more acidic than I'd keep the tank at).

As a long-term solution, some crushed coral - either as substrate or in a mesh bag in one of the filters - will help to buffer the pH in the 7.8 - 8.2 range and avoid any sudden fluctuations.
 
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