According to this:
http://www.bulkreefsupply.com/reef-calculator
Using Randy's recipe for magnesium you'll need about 242 ml of solution to get your Mg up to 1350 (ish). Many salts have low Mg in the 1100 range so water changes can work against you if you're trying for a higher concentration. Doing water changes with a reef salt that's high in Mg might be less expensive than buying retail Mg supplements to increase levels. Just a thought.
Cheers
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20 year old Hagen 100g 6' mixed reef. 36g sump with multiple broken Waveline products removed. Lights T5-LED combo.
1 Coral Beauty, 1 Flame, 1 Blue Tang, 5 Green Chromis, 2 Pajama Cardinals, Asst'd hermits & snails.
2 large boxes of broken expensive aquarium crap. 1 x VERY understanding wife.
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