I'm using the large reactor, but maybe since my XP3 is pretty old it has slowed its gph rate??? I cleaned the filter media to keep the flow rate up, but I still have bubbles. I'll check to see if the flow rate maybe too high, but I doubt it.
I know it's CO2 bubbles because it only happens when the CO2 is on, but can it be that the CO2 is reforming bubbles on the way out of the reactor? The reason I ask is because there are no bubbles making it down to the bottom of the reactor where the output hose sucks the water. Do you think it may help to attach the spray bar? Right now I have the single spout shooting into the middle of the tank.