Unable to get mag up?

[Rscott]

So I was at 1350 and wanted to get up to 1440

I used the calculator on 120 gallon tank using Red Sea liquid foundation and it was around 140ml

I dosed that and a day later there was zero change

What does this mean?

All other parameters seem in check

 

[nereefpat]

Using this calculator: http://reef.diesyst.com/chemcalc/chemcalc.html
It should take about 409 mLs to get 120 gallons from 1350 ppm to 1440 ppm Mg.

1350 is plenty high, by the way.

 

[Rscott]

I’m confused why the calculator I used in BRS was different

1350 is high enough?
Ok then I won’t worry about it

 

[nereefpat]

hmmm. I'm having trouble with the BRS calculator that I found. It doesn't list the Red Sea under liquids.

Under the product's page for Red Sea Mg: https://www.bulkreefsupply.com/reef-foundation-c-mg-red-sea.html
it says "1 mL will raise the magnesium level of 25 gallons by 1 ppm."

So 90ppm x 1mL x (120gallons / 25 gallons) = 432 mLs. I think I did that math correctly.