I have had success "overdosing" the low element for a few days. Usually after three days my numbers come back in line. I have had less success when I stopped dosing the higher element. Your tank will continue to use calcium and if you don't dose it could become depleted. That said, I am not an expert, and it would depend on the size and demand of your tank. I test twice a week and make small adjustments as needed. This has worked for me. Also, try to understand why your alk got so low. These elements are used up pretty evenly, and if one is off, it could mean that your dosing schedule, or pumps(if you use them) need adjustment.