I will stop using those test kits the and try what Tom suggests and see what happens. I hope I dont kill my fish
By the way. I tested the Kh today with 2 test kits. one shows 4 and the other one 3.5. I also tested the ph with three different test kits, sera, hagen low range, and a cheap one i can not remeber the brand i think is prodac. The readings where around 6.4-6.5. I am really having difficulties compairing those colors. Is there any trick on how to accurately compair them and get the exact value of ph?
From my readings and the co2 table with a small error on the readings of kh and ph I can assume that my co2 is between the range of 33 and 48ppm. So I guess with these test kits you can estimate the amount of co2.
I also tested some of the aquarium water after letting it rest for 24 hours and the ph is > 7.5, cant get better reading because my test kits measure up to 7.5.