I just went from the Red Sea Turbo co2 system to the Pro (cylinder) system two days ago on my 55 gal tank. I turn off the system at night and have the bubble counter at 30 during the day. Last night before turning the co2 off I noticed the drop checker was turning yellow so I turned on the underground air stones during the night to give the fish more oxygen. This morning I found the drop checker at yellow. I tested the KH and it was at 22, the GH at 12, and PH 7.0. What am I doing wrong and how do I fix it?
Thanks.