Troubles raising KH

[FragIt Dan]

If your dKh is that low, your corals may be sucking up the carbonates you are adding fairly quickly. If I were in your position, I would confirm your test is accurate and if so, increase your dosing a lot, perhaps doubling it in the short term to get your dkh up. Is this a recent problem? How is it that your dkh is this low... Did you not test for a while? I add ~25grams bicarbonate to ~130gallons/day, although the actual weight is slightly less than that as I convert some bicarbonate to carbonate before i add it. This equates to about 1.5 degrees dkh per day.