Low magnesium

I did a few test with my new Elos Magnesium kit and it looks like I'm running a little low. Assuming I did the test right, and it's pretty hard not to since Elos' test kits are very easy to use, I'm currently at 1100 ppm. So off I went to the supply closet to dose some magnesium. Its going to take awhile to raise it to where it should be ( 1300 -1350 ).

Perhaps the low Magnesium is the reason I've haven't been seeing some of the corals growing as well as they had in the past. I say this because from what I heard at the last club meeting, the only usable calcium is the calcium thats in a 3:1 ratio with magnesium. So at 1100, I only had about 350 ppm of usable calcium even tho normally my levels are about 400 to 425.

Time will tell.