Thanks for the reply. I have my environment dialed in, and it's flexible in several ways. Running a 4x4 tent with a 3x3 flood and drain with Rockwell, and PLC COBs(dimmable). The only thing that might be an issue for a sealed environment and the humidity. Maybe I can do a more resistant strain with lots of Silica.
Another thought is still having the scrubber and fan hooked up to a humidity controller on opposite cycles of the CO2. CO2 is heavy and should fall on the plants. Venting air that is triggered by high humidity might use more CO2 but I think it could work. I'm aware this idea doesn't qualify as a sealed garden, but again I think it is doable.... thoughts?
W/O adding CO2 the environment is perfect, I'm just stubborn and want to add CO2.