Hi all, I've already read: http://www.advancedaquarist.com/2002/11/chemistry Ever since the crash, my calcium has been at 320 ppm no matter what day of the week, and my Alk at a super high 11 dKH and slightly increasing. I've stopped dosing Alk temporarily until it comes back down when I start upping calcium. I'm only dosing about 45 seconds worth of Calcium, but I think I need to change this. If anyone can give me a sanity check, I'd appreciate it: - 70 gallons total system volume - currently at 320 ppm - Want to dose up to 420 ppm - Using BRS 1.1 mL, dosing begins every hour BRS calculator for 2 part says in order for me to get to 420 ppm, I need a total of 716.4 mL I want to split this over a week's worth. So if I'm dosing every hour for a week: - That's 24 hrs * 7 days =168 dosing sessions - 716.4 mL / 168 sessions = 4.26 mL needed per dosing session - 4.26 mL / 1.1 mL/min = 3.88 minutes Does 3.88 minutes seem too much for dosing Calc? Is it OK to stop dosing Alk until things line up? I will be testing every day or so until things stabilize. thanks in advance!