For DIY CO2 generation, I've only used the reactor, tubing, and a diffusor. The pressure of the CO2 being created has always pushed the CO2 into the water on its own. I get 30ppm CO2 with just those 3 parts, plants pearl and oxygen levels remain close to saturation level even an hour before 'sunrise' of the lighting period.
Be careful you are not going to get the yeast/sugar mixture in the tank.
What recipe do you use for your reactor?