Magnesium - Tropical Fish Keeping - Aquarium fish care and resources
 
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post #1 of 4 Old 04-17-2009, 04:25 PM Thread Starter
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Magnesium

A couple quick questions about this substance in reef tanks as I could not find any real good info on it.

1) How do corals use this?
2) How important is this to monitor?
3) What is the benefit of it?
4) How can you raise or decrease and how do you test (just a test kit?)
5) Is it only an important feature if one is to be keeping corals?
and is there any good informative links on the matter?

Thank you,

Adam

Set up: 40 Gal Coral Reef (soon to be!)
2xKoralia 2, 1xHeater 150watt, 1xTunze 9002 skimmer, 50lbs x live rock, 1" argonite sand bed, 1xPhosban Reactor
Livestock: 2xclowns, 1xBlue Tang, 1xCleaner Shrimp, 1xConch, 5xTrochus Snails, 1xBlood Shrimp, 3xHermits, 1xSea Urchin
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post #2 of 4 Old 04-18-2009, 08:09 AM
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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.
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post #3 of 4 Old 04-18-2009, 02:41 PM
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post #4 of 4 Old 04-19-2009, 12:32 AM
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Quote:
Originally Posted by Pasfur View Post
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.

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