I do not recommend choice 3. One or 2 are fine.
This has more:
Reef chemicals calculator
http://home.comcast.net/~jdieck1/chem_calc3.html
Do-It-Yourself Magnesium Supplements for the Reef Aquarium
http://reefkeeping.com/issues/2006-07/rhf/index.php
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Randy Holmes-Farley
Current Tank Info: 120 mixed reef
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