I have a 100 gallon tank and my pH monitor reads 7.5. In the morning before the CO2 kicks on it reads 8.0.

How do I lower this more?

I use a wet/dry but I have removed the drip plate, bio balls, etc... so it is basically just a sump now. I have my CO2 injected directly into my return pump so I get a good mist all over the tank.

The only problem I can think of is that it is outgassing in my sump. Tonight I will put a piece of PVC on the return to have it below the water line to cut down on surface/water agitation.

Any comments would be greatly appreciated.

Keith