My mg depletion rate is 100ppm. Is it possible?

[mark]

Originally Posted by Coleus

Yes I do, I supply 3 tables spoon on my 15g SW and i am using IO reef crystal salt.

You just need 3 tbsp of Mg to supplement 15g? Your IO mix must be way higher than mine out of the pail. Highest I seen has been 1100 so using this calculator and MagFlake looking at 5oz for 15g.