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While I am not an expert nor do I have matter-of-fact links to back any of this up, I believe that a calcium:magnesium ion ratio of between 3:1 and 4:1 (ca:mg) is optimal. Personally I use RO/DI water and dose a 4:1 ratio based on molecular weights.

I think this is something that is often overlooked, I see a lot of people say "I use Epsom Salts to raise GH," well that is only going to increase magnesium and it will be WAY high of a ratio to calcium.
 
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