Quick question. I have started dosing magnesium in order to keep my calcium levels at 450. For awhile the calcium in my tank was beeing sucked out faster than I could add it. I tried Kent's Kalk, Kent CB, and finally reef sucess. I would like to know why I would have a magnesium deficiency. I use Di water and red sea salt. I do 30% water changes monthly. Does anyone else dose Tech M regularly?