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Akira View Drop Down
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Points: 1640 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Akira Quote  Post ReplyReply Direct Link To This Post Topic: Always Low Mag
    Posted: January 11 2012 at 8:54pm
ok so the res of my parameter seem fine why is my mag so hard to keep up around 1300 ?
params are as follows mag, dkh,ca ,sg,temp,ph all by daate

1/3 1320   9.6   390   1.023   76.1   8.35
1/4 1320   10.6  390   .023    75.6   8.27
1/5 1290   10.2  380   .022    75.1   8.34
1/7 1320   10.2  450   .023    75.8   8.24
1/8 1290    9.6   460   .022    74.9   8.27
1/9 1320    9.6    460  .024     75.8  8.34
1/11 1290   9.9   460  .024     75.3  8.38


I dose about 1/3 cup of brightwell mag every other day (4 tsp per 8 oz water) is this normal ? the rest is a few cap fulls every few days ? 
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Ryan Thompson View Drop Down
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Points: 3546 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan Thompson Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2012 at 9:00pm
What salt are you using? How often are you doing water changes?

Magnesium is one of the harder elements to increase. I dose about 50mL/week but I don't know what my current readings are. Magnesium is super hard to overdose so I don't test it as much as I should. I just know it is low when my lobos and frogspawn look a little upset.
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Akira View Drop Down
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Points: 1640 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Akira Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2012 at 9:07pm
I've been running for like 2 months , i have sps , lps , zoas and some softie , like 6 fish , but its still a very small bio load. I did a 12 gal water change 2 weeks ago and a 7 gal last weekend i have been using oceanic natural sea salt  for both . I am dosing well over 50ml ev other day (using dry mix mag ) or is ok to just let it run low as my other params are great ? btw i have a 72g bow with a 30g sump/refuge
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Ryan Thompson View Drop Down
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Points: 3546 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan Thompson Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2012 at 9:19pm
I am gonna say you have a faulty test kit. Oceanic has a super high Mg to start with. Test a batch of recently made saltwater. Measure the salt out to 1.026 and see what Mg reading you get. It should be above 1500 and closer to 1600.

The majority of Mg test kits used in this hobby will be off by about 100ppm. Since your other params aren't jumping all over the place, I would bet that your Mg is where it needs to be.
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Akira View Drop Down
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Points: 1640 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Akira Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2012 at 9:24pm
my test kit is brand new and i use a calibration solution for my refract and i also paid to have my mag checked and they got what i did as a blind test. I wondered if it was just me or my test also :)
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Ryan Thompson View Drop Down
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Points: 3546 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan Thompson Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2012 at 9:28pm
Test kits are still off by ~100ppm in this hobby when it comes to Mg. So you are within range however you look at it.

I wouldn't worry unless your corals look bad. My LPS are the very first to show signs of low Mag.
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Akira View Drop Down
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Points: 1640 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Akira Quote  Post ReplyReply Direct Link To This Post Posted: January 12 2012 at 7:16pm
ok thanks , great info 
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