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Old 08-04-2003, 07:38 PM   #1
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Weird Science

OK, I have been needing to test Mag for awhile, so today I picked up a test kit. The results were quite astonishing....2125 ppm . So what effect does high Mag have on your tank? I have not double checked the results or tested the reference (will do that in the AM). CA were in decent shape, 400 ppm CA and 3.77 meq/l ALK. Any thoughts? Water change is mixing and planned for the morning, with a different brand of salt, if the Mag is truely that high, it has to be from the salt, I have never added any magnesium to my tank and I use Instant Ocean salt (until today). Funny part is I expected it to be low, I have a mangrove in the fuge.
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Old 08-04-2003, 07:55 PM   #2
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how much was the kit, since I also use Instant Ocean and wish to test it.
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Old 08-04-2003, 08:06 PM   #3
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I got a SeaChem kit (cause it is what the LFS had) and it was about 40.00, but does 75 tests of Mag, Borate and Carbonate.
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Old 08-04-2003, 08:11 PM   #4
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was that Reef Status Magnesium Carbonate? cause if so you paid like 15.00 too much

http://www.thatpetplace.com/intro/main.html

serch fish/testing equip/seachem labertorys

25. and change
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Old 08-04-2003, 08:18 PM   #5
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Re: Weird Science

Quote:
Originally Posted by reefrunner69
OK, I have been needing to test Mag for awhile, so today I picked up a test kit. The results were quite astonishing....2125 ppm . So what effect does high Mag have on your tank?
For the most part none really with the exception of bivalves (and rarely univalves). If you have clams and such, they would be the first affected if there was anything to use as a "meter".

I would be curious of the results of a "feshly" made batch as well as a test of the tank water after the trade out.

Quote:
I have never added any magnesium to my tank and I use Instant Ocean salt (until today). Funny part is I expected it to be low, I have a mangrove in the fuge.
That is strange!! 8O but possibley the one plant is not enough to pull the levels down. Any chance you have other additives that contain Mg or possibley Sr?

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Old 08-04-2003, 08:33 PM   #6
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The Kent two part has Mg in it, but that is all, and the amount should be negligable. I have used it in the past and needed to add Mg. I have been using that for less than a week, the oly other thing I add is Kalk, nightly, but not enough t replace all evaporation, usually ends up being about 1/2 the daily evaporation.

Paying a little too much when you want it now, is one of the things we have to deal with. Oh well I don't mind supporting the LFS, they have given me excellent deals on other stuff, I wanted it today and they were there
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Old 08-04-2003, 10:05 PM   #7
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And I quote a site on the web....namely: http://www.aquarium.net/0497/0497_3.shtml

Magnesium is roughly three times more abundant than calcium in natural sea water (1.295g/kg versus 0.412g/kg). Yet it plays a vital part in the whole carbonate scheme of things. This is what keeps the oceans supersaturated in respect to calcite.

---------snip-------------

So your magnesium is a bit high (about 2x what it should be), but from what I was reading, it won't make much difference to living things (at least, not in a detrimental way).

Here's something else I found... http://www.animalnetwork.com/fish/li...&RecordNo=2856

Magnesium: Calcium's little sister

by Randy Holmes-Farley

Magnesium is an interesting atom that has tremendous biological and chemical relevance to reef tanks. Fortunately for reefkeepers, it is present in abundance in seawater and is depleted only slowly. Consequently, maintenance of magnesium levels is not typically a big issue if using an appropriate salt mix. Nevertheless, magnesium is a very important ion and engenders much discussion among hobbyists. In this article I'll try to add to the extensive writings that Craig Bingman has published in the past.

First, a little background on magnesium. In seawater, magnesium is invariably present in the form of a divalent cation, Mg++. It is present in seawater at a concentration of about 1300 ppm, and that concentration does not vary appreciably with depth or location in the world (besides estuaries and other places where all ions are distorted). In seawater, Mg ions outnumber Ca ions by a factor of 5. Most magnesium in seawater is present as the free ion hydrated with tightly bound water molecules. Some of it, however, forms tight ion pairs (i.e., soluble complexes) with negatively charged ions, such as sulfate, bicarbonate, carbonate, borate, fluoride and hydroxide.

--------------snip ---------------------

Personally, I'd just do a few water changes and then recheck it. Also, recheck your test kit against the baseline they give.

Kevin Colagio
Reef Geek.
http://www.PersonalReefs.com
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Old 08-04-2003, 10:11 PM   #8
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OK, so nothing is at risk...whew!!!

New tests:
Reference tested at 1350ppm, which is what was cited on the front of the bottle, so the kit works properly.

Tank water, 2125ppm
Tropic Marin salt (mixed for several hours) 1375ppm

The newly mixed water also clears my RO water, since it was mixed with the RO water. Water change is planned for tomorrow and will up the schedule to reduce the Mg levels in the tank
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Old 08-05-2003, 12:04 AM   #9
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This may sound stupid but how do you check for Calcium? Is there test kits somewhere and where can you find them? With a reef aquarium what all should you check for with corals? Thanks!
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Old 08-05-2003, 12:17 AM   #10
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Yes CA test kits are available as well as alkalinity and Mg. Look to online vendors for the best prices.

I test regularly for:
CA
Alk
Mg (now)
PO4
SG
Nitrates
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