Can't get MG Up

[waterfaller1]

It seems to be dropping instead of increasing.I am on my third bottle of MG...trying to get into a good range.
Reading was 870 this morning.
last time it was 960
Alk~3.43
CA~450

What am I doing wrong?
Corals seem to be loving it,and busting out new branches like crazy!

[Randy Holmes-Farley]

What supplement? What amount? What kit?

It can take a lot of magnesium supplement to boost levels, likely more than you expect This calculator shows how much:

Reef Chemicals Calculator
http://home.comcast.net/~jdieck1/chem_calc3.html


This article may also help:

Magnesium
http://www.advancedaquarist.com/issues/oct2003/chem.htm

[waterfaller1]

Sorry..
Ocean's Blend is the supplement.
Adding 20 ml. per day,approx 100 gal. tank,Salifert test{but over 2 years old}.
Thanks

[cbjedi]

Don't know if this will help but my alk was 2.5 meg/l and Cal-460, mag was at 1280. I added 40ML of Kent tech-M and it went to 1305 waited a day added 80ML and it went to 1330.

[waterfaller1]

I add 60 ml. each of A & B per day,sometimes a bit more alk/ph.It says to be careful not to raise MG more than 100 ppm per day.

[Randy Holmes-Farley]

I agree that I would not add more than 100 ppm magnesium per day, but according to the calculator, 20 mL per day of Oceans Blend is only 10 ppm magnesium per day in a 100 gallon tank.

[waterfaller1]

That's why they pay you the BIG bucks!;) Thanks so much!

[Randy Holmes-Farley]

:D

You're welcome

Good luck. :)

[waterfaller1]

One more question if I may...
I have been told by the manufacturer of OB that once I get my MG within range 1200-1500,that my A&B will maintain it.Your thoughts?Also..1200-1500 is quite a range,what's best?
If it helps to know,I use Tropic Marin Pro salt mix.;) One more note to add,this is a 75 gal tank with 20 sump,and 29 refugium,so 100 gal. is estimated total volume of water.
Thanks again,Carole

[Randy Holmes-Farley]

I have been told by the manufacturer of OB that once I get my MG within range 1200-1500,that my A&B will maintain it.Your thoughts?Also..1200-1500 is quite a range,what's best?

It might. In theory one can make one that does. I'm not sure exactly how much magnesium is in OB, however. :)

I suggest that folks target 1250-1350 ppm magnesium, but being a bit higher is likely OK.

[jdieck]

Originally posted by waterfaller1
One more question if I may...
I have been told by the manufacturer of OB that once I get my MG within range 1200-1500,that my A&B will maintain it.Your thoughts?

Yes, the Part 1 (Calcium) of the two part OB supplement contains Magnesium in an amount estimated to maintain a normal consumption. Although your consumption may not be the one of an average aquarium, it will help to maintain the level.