Dosing Mg

[Reef Pilot]

Originally Posted by tang daddy

Surprisingly most people don't have to dose it, I am dosing 180 ml for my 90g of water volume daily. That's alot considering of small water volume... I couldn't keep up and had to get a doser.

Yeah, that's a lot, alright. I have never had to dose Mg so far, and hopefully won't have to do that much. That's why I would like to start off with manual dosing. And even try combining it with my Ca dosing, if that works. I really don't want to get another doser...

[Bblinks]

Even with my calcium reactor filled with 20% magnesium I still find myself having to add it manually. Like T-diddy said, 100 ppm per day is the maximum. I have dosed up to 2.5 gallons at a time without any problems and that only raised my mag from 1250 to 1320.

[tang daddy]

Originally Posted by Bblinks

Even with my calcium reactor filled with 20% magnesium I still find myself having to add it manually. Like T-diddy said, 100 ppm per day is the maximum. I have dosed up to 2.5 gallons at a time without any problems and that only raised my mag from 1250 to 1320.

T-diddy dat new.... I like T-Dot!

[Reef Pilot]

My Mg has been running about 1260 ppm lately (used to be around 1400), so decided to start raising it with manual dosing. Yesterday I added 125 grams of Seachem Reef Advantage Magnesium to a 230 gal water vol. This is only 1/2 the maximum dose they recommend for one day. And to raise it all the way to 1350, their dosing calculator says I need to add about 8 or 900 grams, which seems like a lot to me.

So today, I test my Mg again to see what effect it had. And to my surprise, my Mg is now higher than 1500, which is the max I could test for with my Salifert test kit!! WTF!!! It should only have gone up by maybe 10 - 15 ppm according to their instructions.

I reread and reread the instructions, and did more research on the web, but can't figure out what I did wrong.

I also tested my alk (8 dKH) and Ca (400 ppm) and it did not change much from yesterday. And everything in my tank(s) look normal.

I will test again tomorrow. But any ideas what is going on here??

[e46er]

Strange maybe your initial test was off?
I have used lots of seachem products (mainly my old planted tank) but a few for SW and Their magnesium is the single only product I haven't liked.
My mg was low and over like 2 weeks I had dumped the entire 600 g tub in with no increase.
I got some mag. From little silver max and his product rasied it exactly what he said it would with an online calculator.

My guess is your original testing was off

[Reef Pilot]

Tested again today, and it came in at 1290 which makes more sense. My guess is that yesterday I may not have pulled in the test solution to the top mark in the syringe. I have tested Mg many times before, and never had a bad test, so a little strange that it would happen right after adding Mg.

Anyway, will add more MG today, and keep tracking it.

[Proteus]

I had the same issue with seachem mag and there calculator. I ended up cutting the recommended dose in half and making sure the tanks water mixed for 2 hours before retest