FM ultra mag?

[jaggy]

i am confused with this product , it says it is for calcium reactors? does or can this replace my ARM media and provide calcium and magnes. or is it just MAG . it provides, can it be mixed with the arm media etc?

[jobr]

UltraMAG is a calcium AND magnesium substrate based on natural Dolomite rock, to be used in Calcium reactors. UltraMAG continuously releases magnesium and helps to maintain very constant Mg levels in the tank. It has also a high CO2 binding capacity and reduces the introduction of excess CO2 into the tank.
Ultramag is ONLY for the use in calcium reactors Dosing recommendation: max. 10% of the reactor volume. Do not overdose. Ideally suited for placing in degassig chambers.
Please do all changes in your tank carefully and stick to the dosing recommendations. In you are not sure, please ask us for assistance.

from the FM site

[jacksok]

Dolomite is calcium magnesium carbonate CaMg(CO3)2 . A number of firms package and sell it, not just FM (e.g: Aqua Medic, Grotech).

Given ARM already has elevated levels of magnesium I doubt you'd want to add dolomite to it.

Keith