[nycman]

I battled low Ph for months. It was dipping below 8.0 during the night. I attached a CO2 scrubber to my skimmer which helped slightly, but not really enough. I was dosing Kalk in my ATO water as well. However, I read on BRS site directions for properly dosing Kalk in ATO and it specified to not mix it too much. So I removed a permanent powerhead in my ATO container (far less mixing) and my PH shot up to 8.3 - 8.4.