CO2 Drop Check and PH monitor
I have been using 2 co2 drop check on two tanks for over a year with the same liquid and it works fine. recently i completely re-did 120g with a SUMP. And its previous setup was with canister.
The CO2 drop check on 120g never changes the color. I places it on the back right, front right, and front left in conjunction with the return of Co2 reactor on the left back. on the other hand, my Marine PH monitor shows the decrease in PH by approx 0.5-0.7. The same drop check/liquid on my 30g is working fine. I replaced the liquid a few time already but it nerver shows the change of color.
Anyone knows the reason why or recommendation?