Currently up to 120 ml calcium, 105 ml alkalinity and 230 ml magnesium per day. Running 2 apex DOS (1 head acts as my top off pump for my 90 on the second floor. Love not having to haul water up the stairs to fill the top off container any more.). I’m also dosing 15 ml phytoplankton for my small clams and gorgonians. Thinking about dosing strontium as well. I need to do more research on this, and it’s a pain to test.