I'm just now coming down off this situation---I was advised to boost the alk to 3.5 (that's the other reckoning) and just be patient. I'm having to rebuffer daily, but in small doses. My magnesium was off the chart: now it's 1470. So it's working. [The side effect was great coralline growth: I think it was the magnesium, but am not sure.] Shall we say, everything is happier as the general alk rises and the other parameters fall. After it reaches 3.5, I'll let it fall to 2.97 with a cal of 400. Hopefully this will happen... Hope that helps.