salt question

My tanks do best at 1.025. In the summer I keep mine at about 1.024 so it won't get too high with all the evaporation that goes on. I agree with Pacific Reefs, the refractometer is absolutely the best and most accurate way to test salinity. GL!
 
The low end, 1.022, 1.023 is ok for a fish only predator tank, but for tanks with corals and inverts keep it at 1.025 or 35 PPT. using a calibrated refractometer.
 
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