Calcium

[mustseefish]

I have a 20 gallon reef tank and my calcium levels are reading at 380 ppm. They gave me foundation magnesium at the store I’m not sure if this raises calcium levels but if so how many ml of it should I add to get to 400?

 

[gbroadbridge]

That product does not increase Calcium, it increases Magnesium.

Did the LFS test your Magnesium level and if so what is it?

 

[tzabor10]

Agreed, what testing kit are you using? Mg helps with Ca and kH stability. But will not change their concentration

 

[mustseefish]

My kit doesn’t test for magnesium it tests for calcium, kh, phosphate, nitrate

 

[gbroadbridge]

My kit doesn’t test for magnesium it tests for calcium, kh, phosphate, nitrate

Thats fine - you really don't need to test Magnesium.

The reason I asked if the LFS had tested Mg, is because if MG is very low it may also cause Calcium to be low.
I'm wondering if it's the reason why your LFS gave you a Mag supplement.

 

[Naekuh]

You said you needed Ca, and they gave you Mg?

Find a new LFS after you return that product.