Background: My system only seems to be using alkalinity, a small amount of magnesium and a token amount of calcium. I only have a 2-head dosing setup, so I was wondering if I can combine a small amount of the Red Sea Foundation A (Calcium) with the Red Sea Foundation C (Magnesium). This would be the 1L liquid supplement. According to Red sea’s website I can combine Foundation AC, but I’m not sure if they’re referring to the powder or if this is accurate (Red sea has yet to respond). I can always dose calcium manually, so it’s not a huge issue (just wondering if I could eliminate that step). Any clarification would be greatly appreciated, thanks.