[codetiger]

What fluid are you using in your co2 checker? The co2 checkers (aka drop checker) take a while to react to changes in pH, they are commonly 2-3 hours behind.

I am not sure what fluid exactly (came long with drop checker) but it worked on my smaller tank and I was able to see color changing to greenish. I am aware that it usually takes 2 to 3 hours to change color but it stays bluish in my large tank all day. If i increase the bps my fishes start gasping.

 

[codetiger]

Thanks for the information.
I’ve started increasing CO2 bubbles for last 2 days and seeing some color change in the fluid. I’ve placed the dispenser against the water current generated by powerhead so it goes round the tank. Now the fluid has started turning greenish when I see in the evening. I’ve to check the ph sometime.