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Old 10-18-2011, 08:44 PM   #1
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Manesium Question

Finally bought a magnisium test kit. I went with the Elos kit. I would appreciate it if anyone can answer a couple questions for me.

1. Mag should be between 1200-1500 if I remember right. Is that correct?
2. My mag tested at 1100 and my calcium is at 440. That indicates that while I have enough calcium my corals may not be able to get the full bennifits because my mag is low. Correct?
3. I seem to remember someone saying you can use baking soda to raise the mag. Is that correct and if so, can you explain how much per gallon and the correct way to introduce it to the tank?

As always, thanks for all the help.
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Old 10-18-2011, 09:06 PM   #2
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1100 isn't bad, and with your Ca at 440ppm, it shouldn't be a problem. Baking soda is sodium bicarbonate, which would raise your alkalinity, not magnesium.

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Old 10-18-2011, 09:30 PM   #3
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Mag should be 1250-1350.
Reef Aquarium Water Parameters by Randy Holmes-Farley - Reefkeeping.com
"For practical purposes, 1250-1350 ppm is fine, and levels slightly outside that range (1200-1400 ppm) are also likely acceptable."

You can use epsom salts to raise your magnesium.
Do-It-Yourself Magnesium Supplements for the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com
"Using Epsom salts only, dissolve 8 cups Epsom salts in one gallon of water, and use that to supplement magnesium in amounts determined by using this linked online calculator, with the entry "Randy's Recipes 1 and 2 Versions A and B," and ignore for this purpose what those designations mean."
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Old 10-19-2011, 09:12 AM   #4
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Thanks guys. That is great info and just what I was looking for.

One other question came up last night. Almost from the get go, I had good coralline algae growth on the tank walls. I decided to let it go its own course on the back wall of the tank. Last night, I noticed it is disappearing fast and the water was a bit hazy and there were small white flakes suspended in the water column. I am assuming that is the coralline that is coming off the tank wall. Any ideas on what the cause may be?

My test results from last night were:

Temp 81 (yes, I know a bit high)
Salinity 1.025
PH 8.2
Am 0
Nitrite 0
Nitrate 0
Cal 440
KH 7 (125.3)
Phosphate 0
Mag 1100

I did put carbon in my canister filter about a month ago and have not changed it out. Could that be the culprit?
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Old 10-19-2011, 10:53 AM   #5
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an increase in lighting can kill off coralline.
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Old 10-19-2011, 11:10 AM   #6
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Thanks Doug. That very well may be what happened then since I went from a 36" two lamp T5HO to a 48" six lamp T5HO.

I went through the article that Larry gave me and I have a couple of additional questions. After rock and sand, I calculate a water volume of about 30 gallons. Per the calculator it says I need to add 7.3 oz if I am using the Epson Salt method. I am assuming that means fluid ounces after the solution is mixed. Since I don't want to dose more than 100 ppm per day, I would split that into two doses of 3.6 fl oz correct? Also, since the article says to mix 8 cups of epson salt to 1 gallon of RO/DI it wold give me tons more than I need. Can I do the math and go with one cup in 16 fl oz of RO/DI and accomplish the same thing?
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Old 10-19-2011, 07:05 PM   #7
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Yes on both.
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Old 10-20-2011, 09:38 AM   #8
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Thanks Larry. Figured that was the case but...... LOL
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