Jag1980 Got Plants? Aug 18, 2008 1,236 1 0 45 Marysville, Wa Oct 29, 2008 #11 Riiz said: It should be a deep blue, lol. If its green to begin with, how its going to let you know when you hit 30ppm or so of CO2. Click to expand... That's what I was thinkng last night. I got 4kH but the pH shows blue. Then my tester has a yellow, green, blue, How would it turn blue if you are using Co2...erv:
Riiz said: It should be a deep blue, lol. If its green to begin with, how its going to let you know when you hit 30ppm or so of CO2. Click to expand... That's what I was thinkng last night. I got 4kH but the pH shows blue. Then my tester has a yellow, green, blue, How would it turn blue if you are using Co2...erv:
erv: