Co2 drop checker color never changes
My 55g has been running for 2 weeks now. 4 days with the co2 system. Currently set at 1bps at 22psi. Fluval drop checker with the Fluval solution. It started blue and after a few hours turned green and has remained there. I turn the co2 on 1hr before the light and off 1 hour before the light turns off.
My drop checker never changed though ever since it went green. Day, night, morning it's always green. Shouldn't it turn back to blue over the night? I moved it so it's in better flowing area but didn't help. Fish are fine. Dosing seachem ferts right now but just ordered all the EI ferts from green leaf aquariums to start that.
Any help is greatly appreciated!