First the background info...
I have a 300 gallon mixed reef that I would say is sps dominated. For equipment, I am currently running a MRC calcium reactor with magnesium crystals added. I have an Aquamedic kalk reactor as well that is ran through my ato but only when the PH is below 2.5. If...
There are many different ions in seawater, and as reef aquarists we generally only test for a small number of these. Calcium, magnesium, “alkalinity”, nitrate, phosphate, and ammonia, for example, are relatively easy for hobbyists to test at home using kits. Other ions, however, are more...