So apparently the issue with my CO2 system has to do with how I've added the second bottle to the system. When I attach 1 bottle the system works fine but as soon as I attach the second bottle no more bubbles.
The system with the two bottles looks like this (minus the reactor and the check valves):
I can't think of where the issue is. I'm thinking maybe the gas coming from the two bottles is competing with each other. I'm thinking maybe have the T connector at the Gas Separator bottle instead of between the two generator bottles. Might this alleviate the issue?
The system with the two bottles looks like this (minus the reactor and the check valves):

I can't think of where the issue is. I'm thinking maybe the gas coming from the two bottles is competing with each other. I'm thinking maybe have the T connector at the Gas Separator bottle instead of between the two generator bottles. Might this alleviate the issue?