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Unread 01/29/2018, 05:28 PM   #1
mpderksen
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Ultra-high Mg

I added an entire gallon of super concentrated Mg (BRS mix) in place of RO. Yes, I need to label. My 150g now sits at 2750ppm. I have been using Reef Crystals.
I ordered a 200gal box of IO, since it has lower Mg, and plan to do some bulk water changes. Is there a better strategy?


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Unread 01/29/2018, 05:48 PM   #2
outssider
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check your specific gravity. With the addition of that much mg it will have risen !!


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Unread 01/29/2018, 06:38 PM   #3
bertoni
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There's no practical way to reduce the magnesium level other than water changes. I guess I'd check the SG, as well. I'd be careful about making water changes large enough that live rock gets exposed. Sometimes, that causes a lot of die-off.

How are the animals doing? There might be some sort of toxic impurity in the supplement that could become an issue at such a high dose.


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Unread 01/29/2018, 08:11 PM   #4
mpderksen
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SG is 1.027. All the livestock seems fine. No clue about the brittle stars that rarely see.


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Unread 01/29/2018, 08:38 PM   #5
bertoni
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I suspect that the tank will be fine, then, although I might try to check on the brittle stars from time to time, if and when there's an opportunity.


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Unread 01/30/2018, 12:22 PM   #6
mpderksen
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I should have provided the other of the “big 3”. My Alk is 8.7, and Ca 242. (Red Sea and Hanna tests, respectively. Significant losses, recently, in LPS, but I suspect this is due to adding GFO, in addition to my fuge, since I saw a rise in PO4. I over reacted, and likely stripped too much, too fast.


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Unread 01/30/2018, 03:55 PM   #7
bertoni
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Calcium at 242 ppm requires some dosing. Is that a typo? I'd dose 50 ppm, then another 50 ppm or so twice a day until the level was acceptable.


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Unread 03/23/2018, 01:31 PM   #8
mpderksen
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Quote:
Originally Posted by bertoni View Post
Calcium at 242 ppm requires some dosing. Is that a typo? I'd dose 50 ppm, then another 50 ppm or so twice a day until the level was acceptable.


Sorry, yes. Typo. 424. Since there is interaction with the Mg, I’m having a rough time keeping that stable.



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Unread 03/23/2018, 11:37 PM   #9
bertoni
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I probably would do some water changes at this point, although I'm not sure what effect that magnesium level might be having. A few 20% changes should help a lot, and not be too much trouble, I hope. Otherwise, you'll probably need to measure and dose alkalinity and possibly calcium every couple of days or more frequently.


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Unread 03/24/2018, 03:38 AM   #10
Phixman
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I would do many water changes myself, I don't think it will affect corals short term, but in the long term, over a period of days, it could shock the tank.


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