Hi all My Co2 system has been up and running for 2 weeks and set at 1 bubble per second, I thought I would set it low to start with as I didnt have a drop checker . I got the jbl drop checker Tuesday from aqua essentials, with some 4Dkh water to set it up and after 3 hours, hey presto, nice and green! I then moved it to the opposite end of the tank, away from the Co2 and its still green! Question is, is it possible that my German Co2 kit , off ebay, with the 3000ltr diffuser being driven by an Ehiem pro 2, capable of putting enough Co2 into my 600ltr tank? The tank does have glass covers which will help but stil is 1 bubble per second enough?