04-19-2009, 12:32 AM
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Originally Posted by Pasfur
Different people treat magnesium in different ways. I feel that you need to be aware of magnesium and its effect on alkalinity. Magnesium is utilized by the buffer system in a way similar to calcium. These 2 are the primary drivers of your alkalinity.
Some people test for magnesium and adjust when necessary with an additive. I have always relied on my alkalinity and calcium tests to intuitively confirm for me that magnesium levels are appropriate. I plan to test for magnesium directly and add magnesium directly to my 180, because the water changes necessary to replenish the lost magnesium would be to extreme for my tastes. This will be a 3rd step in my alkalinity testing. The assumption being... if calcium is high and alkalinity is low, then test for magnesium, confirm the magnesium deficiency, and add a supplement.
I will let someone else elaborate on how corals utilize magnesium. My understanding is that corals use magnesium in a similar way to calcium. These topics get complicated.
I do the same, but as i get more and more SPS corals, I find i will eventually need more.