help with test kit

[dartfrog]

I just recieved a Red Sea magnesium test kit (I know they aren't the best but it fit my budget) The directions read:

Natural seawater (with a S.G. of 1.021) has a Magnesium level of approximately 1270 ppm. At lower salinities the magnesium levels should be proportionately less...

then there is a chart that reads:

Proportional concentration of Magnesium according to salinity
<u>S.G.</u> <u>Mag ppm </u>
1.020 - 1015
1.021 - 1065
1.022 - 1120
1.023 - 1170
1.024 - 1220
1.025 - 1270

Am I missing something or does this look right to y'all. I placed a call to them but customer service is out to lunch...

 

[weaglereefer]

You want Mg to be appx. 3x the level of Ca. Most shoot for 1250-1350. What are you asking?

 

[hackman72]

au01st;459730 wrote: You want Mg to be appx. 3x the level of Ca. Most shoot for 1250-1350. What are you asking?

+1 Not exactly sure what the question was. You basically have target numbers you're trying to get with all the parameters. If you're salinity is dropping doesn't necesarily mean you want the Magnesium to drop with it.

 

[hn1]

The numbers are off somewhere...

Natural seawater (with a S.G. of 1.021) has a Magnesium level of approximately 1270 ppm. At lower salinities the magnesium levels should be proportionately less...

then there is a chart that reads:

Proportional concentration of Magnesium according to salinity
<u>S.G.</u> <u>Mag ppm </u>
1.020 - 1015
1.021 - 1065
1.022 - 1120
1.023 - 1170
1.024 - 1220
1.025 - 1270

 

[dartfrog]

The numbers are off somewhere...

Natural seawater (with a S.G. of 1.021) has a Magnesium level of approximately 1270 ppm. At lower salinities the magnesium levels should be proportionately less...

then there is a chart that reads:

Proportional concentration of Magnesium according to salinity
<u>S.G.</u> <u>Mag ppm </u>
1.020 - 1015
1.021 - 1065
1.022 - 1120
1.023 - 1170
1.024 - 1220
1.025 - 1270

Yes, the fact that their numbers don't match...that was what I was trying to figure out. I thought I was missing something or I just didn't understand. To clarify, I talked to Red Sea Tech. support and there answer was "yes it is right". I asked "which one is right S.G. of 1.021= mag 1065 ppm or 1270ppm?" their answer was natural sea water was 1270 but aquarium water should be 1065. Now, I'm no expert but are we not trying to mimic Natural Seawater? What would be there reasoning for this?

The reason for my concern was I was going to attempt to kill the last patch of remaining Bryopsis by raising Mag to 1800. I have successfully removed about 85% of what was there through many large water changes over the past few months, but this last patch will not go away. The discrepency in their numbers shouldn't effect the test, but the last test kit I bought was an Elos alkalinity, and their instructions were wrong too. I'm beginning to wonder?

 

[acroholic]

I'd keep my mag at about 1350 no matter what my SG was, which is usually 1.025-1.026