ah... I was searching for a drop checker, not a co2 indicator. Has anyone used this one before?Big Als Online should have one! The Red Sea one
Red Sea CO2 Indicator - Plant Care - Co2 Systems/Parts at BigalsOnline
I saw it. I was thinking that I would buy the 'proper' stuff first, so that when I made the solution, I would be sure that it works the way its suppose to...As for the 4dkh solution, check the planted section.. i posted how you can make your own!