Low Magnesium dosing help

[juboy27]

Ok where do I start, okay up until three months ago I have not tested for magnesium. In till I noticed some of my corals were dying. So someone suggested testing magnesium. Not surprised the magnesium Reading only 850mg. I have a 500 L tank and 100 L tank.but just concentrating on my 500 L I started to do lots of small water changes. To increase the magnesium levels, however I was getting nowhere. As not realising at the time The magnesium level in my new salt water mix was only 1000mg, so I am using a new salt now Brightwel neomarine reef salt. Which contains 1380mg in my new salts mix.unfortunately I can only do small water changes as this is a new salt as is been introduced into my system. So I am back to the same problem keeping my magnesium levels up. At the moment I am dosing in my auto top up system, Brightwel kalk +2 to see if this helps, but it contains very little magnesium. I also have a liquid Brightwell magnesium bottle. I have tried injecting 60ml straight in to the aquarium with this it helps but takes a lot of magnesium to increase the tanks magnesium.
One suggestion I had was adding liquid magnesium, to my kalk +2 mix in my auto top off unit. Does anyone know if this is safe to do
Who is some tank information:
500l tank
Ca 460
Kh 8
Ph 8.3
Mg 950
Nitrate 1
Ammonia 0
Phosphite 1
Salt 1.025
Temp 25c
I am running a protein skimmer
I am also running carbonate
I am open to anyone's suggestions, I did see somewhere someone dousing new salts mix into the tank doing a very slow water change over the course of a week is this possible or may be a solution.
Thanks agin

 

[downbeach]

What is your SG; are you sure its accurate? What test kit, and are you sure you're doing the test properly? You might want to get a second opinion on the Mg test.

 

[juboy27]

Hi I am using all elos test kits. Sg is 1.025, Yes I thoughts of that and went and got a brand-new Elos test kit. I have Recalibrated my refractometer to day with ro water at 20c. I just don't think I am dosing right

 

[juboy27]

I an trying to take a photo of my test book so you can have a look

 

[downbeach]

I would get some 335ppt calibration solution for the refractometer, using plain RO/DI water to calibrate leaves a potential for something Randy calls "slope miscalibration" from this article. Brightwell claims an average Mg of ~1300 @ a SG of 1.025, which is leading me to believe that your refractometer is off, and causing you to add too little salt mix. The uptake of Mg in any system is relatively small, and with regular WC's rarely needs to be supplemented.
Another possibility would be the fact that many salt mixes can separate into their elemental grain sized during shipping, and should be thoroughly mixed prior to use, if you'r not using the whole package, to get the proper formulation.

 

[codyreed29]

I use kent salt they have high magnesium. I am also dosing kent tech m But only until I rid of broysis. If you have broysis which is a pits lol . Use the tech m stuff. Then switch to a brightwell or other supposly techm KENT PRODUCT has some heavy mtals and should not be a long term solution but probably wouldn't kill your corals or anything.

I have been dumping loads of it into my tank and then I wait a couple days. Will continue to do so until the broysis melts. I also do weekly water changes 10 percent with kent salt and all I really need to add is kalk which I dose 2 part.

Bright well aquatics and use as directed one week a month like dose as directed for the first wekk of each month.

 

[juboy27]

Will just an up date I went out and got a new refractometer. And have been adding magnesium each day and now up to 1400 mg. So now I have got to think about dosing long term. I have not used my brightwell kalk +2 yet and was think of getting that going. But a cant work out the math if it would keep up my mg now ?

 

[juboy27]

 

[juboy27]

Just posted my tested test readings above, my magnesium at 3pm yesterday the got 1450ppm and test magnesium at 10pm some day and got a magnesium reading of 1250ppm wow wot a drop. Thats a big drip yes ??

 

[dgolan7]

Mag it's self is something that I rarely dose. I run about 3/4 to a gallon of 2 part before I add any mag. You also could use a 2 part like ocean blends with trace mag in it.