My tank is FULL of coralline and I have never dosed Strontium. The only thing that I dose my tank is B-Ionic and sometime reef ca. My ca ranges from 410 to 460ppm and alka ranges from 9.2 - 10.6 dKh. I am not saying that dosing strontium and magnesium doesn't help as I am sure it would. In my case I have never added it. I use reef crystal and do a 10 water changes everyother week. Running 2 X 250 MH 12,000K and 2 X 96 PC 10,000K.
Even my clam shell is covered with it
My Site
http://barryreef.homestead.com/index.html