I use Fauna Marin Magnesium chloride. I add 2 cups to my 15-gallon waterchange tub along with 1 tbsp epsom salt (Magnesium sulfate) using H2Ocean salt. The "perfect" ratio according to Randy Holmes-Farley (I think it was him) is 8.5:1. You do not want to use epsom salt as the primary source because there will be too much sulfate in the tank. It takes a lot of powdered magnesium product to raise magnesium, meaning there is a lot of chloride (or sulfate) being added. Adding the product this way, I do not have to dose magnesium otherwise.
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~ Mindy
SPS fanatic.
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