I have been struggling with keeping my 125g reef mixed tank alkalinity stable. I would like to keep the Alk between 8.2-8.5 DKH. I can get the Alk to the target parameters, but keeping it there for more than a couple of days seems to elude me. To start off with, I will dose my 2 part until I get the Alk to where I want it. Then I stop dosing for 24 hours and let the Alk drop. I measure the decrease and punch that into the Reef Chemistry calculator. The amount of 2 part that the Reef Chemistry calculator gives me, I start dosing. This should be my new daily dosing amount (correct?). However, after 2-3 days, the Alk starts to increase again. I haven't dosed any Calcium because it is staying between 450-500 ppm. If I continue to does the suggested amount of Alk from the Reef Chemistry calculator for a week, the Alk will rise from 8.2 to 9.5 DKH.
Am I doing something wrong? if so, how can I correct my mistake and keep the Alk stable?
Am I doing something wrong? if so, how can I correct my mistake and keep the Alk stable?