02-02-2010, 06:07 PM
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I believe you're working too hard at this. Specific gravity is simply the ratio of the density of any liquid compared to the density of distilled water (which has a specific gravity of 1). Any liquid can be compared to water in terms of specific gravity, but since we're only addressing sea water here, we can simply call it specific gravity and forget the "salinity" part of this. They would both mean the same thing.
Simply remove some tank water and add a concentrated mixture of salt water to the tank - SLOWLY - over a period of several hours, or even a day or so until your SG reaches 1.024 (or to wherever you want it).