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06/06/2014, 06:32 PM | #1 |
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Join Date: Apr 2009
Location: Albuquerque, NM
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really high Mg? >1600
So I finally broke down and bought a dosing pump (fish street) and some BRS 2 part, and a red sea Reef Foundation pro test Kit.
I'd been using Seachem Reef Complete and Reef Carbonate just following the basic instructions, adding about 15ml 3x a week to my 60g reef system...things have been ok (mostly) for several years with that system but I was growing tired of manually dosing. So before I set up the dosing I did my tests. I've never tested magnesium in my tank and I am kind of surprised by what I tested at. According to the Red Sea kit I am at 1680ppm Mg. I guess Reef Complete has mag in it, but why should it be so out of whack? (A second test changed at about the same point, maybe 1660ppm) So I have: Ca 460 KH 7.6º Mg 1680 should that be a concern, can I get things back on track with 2 part, will a sharp drop in Mg from a 20% wc harm anything? Right now the tank is mostly softies with a medium sized Duncan and some random acro frags, but no clams or big SPS colonies. thanks for any advice or comments in advance! -Doug |
06/06/2014, 09:18 PM | #2 |
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Join Date: Apr 2009
Location: Albuquerque, NM
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so I missed another post about this today: http://www.reefcentral.com/forums/sh....php?t=2416444
The Red Sea kit Mg test is bunk? |
06/06/2014, 10:07 PM | #3 |
Excessive Minimalist
Join Date: May 2004
Location: Republic of Texas
Posts: 747
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My Red Sea Mg matches my Salifert Mg if you follow the instructions exactly (which are a bit cumbersome).
Nice video here: http://m.youtube.com/watch?v=MofaqM-I6uM |
06/06/2014, 11:20 PM | #4 |
Moved On
Join Date: Feb 2013
Posts: 4,757
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What salt do you use? Oceanic, for example, contains pretty high Mg.
I've had mine up to 1700 or 1800 with no ill effects. Some people drive it up higher than that when using Tech M to kill bryopsis. |
06/07/2014, 06:51 AM | #5 |
Reef Chemist
Join Date: Apr 2001
Location: Arlington, Massachusetts
Posts: 86,233
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If you are using a Red Sea kit to get that value, then it might be the kit, but yes, knowing what salt mix would also help figure out if it is real or not.
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Randy Holmes-Farley Current Tank Info: 120 mixed reef |
06/07/2014, 11:30 AM | #6 |
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I use IO Reef Crystals but I haven't done a WC in about 6-7 weeks.
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06/07/2014, 11:52 AM | #7 | |
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Quote:
Also thank you Randy for just being so quick to assist when we have questions |
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06/07/2014, 12:12 PM | #8 |
Reef Chemist
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Location: Arlington, Massachusetts
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Happy Reefing.
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Randy Holmes-Farley Current Tank Info: 120 mixed reef |
06/07/2014, 09:10 PM | #9 |
Excessive Minimalist
Join Date: May 2004
Location: Republic of Texas
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Just to be sure, this evening I did another cross check with my Red Sea Mg kit (following the instructions *exactly*) and two Salifert Mg kits (one in-date, one just expired), and got similar readings (as expected).
I then did a "rushed" test (not waiting 15 seconds to swirl each drop) with the Red Sea kit and got the "1600 result". Interestingly, when I did the same (rush) with the Salifert kit I got a reading consistent (within what I'd call a reasonable amount) with the prior (non-rushed) Salifert reading. But, the Red Sea Mg kit is less expensive than the Salifert kit if you get it as part of the Big Three kit, and unlike Salifert you can buy refills for the Red Sea kits. Last edited by hilgert; 06/07/2014 at 09:47 PM. |
06/07/2014, 09:29 PM | #10 |
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Join Date: Sep 2006
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I'm thinking high mag levels don't hurt anything if it is raised gradually. Lots of people get rid of bryopsis by raising mag up to 1800 without problems. Can someone confirm?
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06/08/2014, 05:19 AM | #11 |
Reef Chemist
Join Date: Apr 2001
Location: Arlington, Massachusetts
Posts: 86,233
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I wouldn't recommend maintaining magnesium that high since, yes, some people do report problems when doing the bryopsis kill experiment (snails immobile, etc), although one cannot know if those problems are due to the magnesium or impurities in the magnesium additive (or possibly even coincidence).
FWIW, it seems very unlikely to me from first principles that commercial magnesium supplements are magically able to kill bryopsis and not harm any other creature that reefers maintain.
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Randy Holmes-Farley Current Tank Info: 120 mixed reef |
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