06-21-2008, 07:18 PM
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In SW, when evaporation happens, you Top-off only with RO water. No salt. You see, salt doesn't evaporate. Water does.
Oh, and make sure you top-off every few days, even if it doesnt look like much evaporated. If you dont, it can mess up your SG, dependant on the tank size. I have seen my 10G fluctuate .001-.002 away from my orginal SG, which can be bad. Fortunatley, I keep my reef at 1.024.