[fishymatty]

I have the REDsea drop checker and I change the water in it at every water change but it goes yellow which is co2+ with in an hour of changing and even after the tank being aerated at night it is still yellow in the morning. My fish never seem to be o2 starved but is the drop checker working? I'm going to check the ph/kh and see what the truth is.
Just wondering if anybody had similar experience?

 

[fishymatty]

I am using the stuff that came with it.
I don't know what kh reference solution is

 

[fishymatty]

according to the co2 chart I have about 44ppm of co2. If thats the case then I can see why the drop checker is showing + but I'm just wondering why even with aeration over night it is always so high.