I've been using a glass drop checker I bought off of eBay for awhile now. I've noticed that there is a gooey membrane that forms around the inside of the glass where the water and air meet. I'm using a 4KH solution and the reagent that was sent with the drop checker. I'm not sure if the membrane is permeable. So I wonder I've been getting false readings? The drop checker never really changes from green. Is it supposed to turn blue at night? I turn the CO2 off 30 min before lights out so the CO2 levels should go down some , but I'm not sure if it would be noticeable. Is this a problem for determining relatively accurate CO2 levels? If so...what can I do to solve the problem?
Thanks,
Creighton
Thanks,
Creighton