Yeast Co2 Question

I made a Milk Jug yeast Co2 system today.... I was wondering if I should take the Co2 tube out during the night.. I hooked it up to the fan that's inside blowing down on my woman..... I know it is prob. no where near 1500 ppm, and plants use Co2 like we use oxygen... Its not a air sealed box and i have comp fans on like 3 volts (very slow) while the lights are off to circulate... I'm a week in to flower and the blue dynamite looks goooooood SO co2 Yeast makers do you take the tube out at night?

Its not like you need the Co2 for lots of hours. 2 hours a day should be good.

...yea the fan is on really low to keep a little circulation in the box..... when I do my next gro I will prob. get a Co2 container w/ regulator and timers when the co2 comes on the fans go off....but this is my first and I had to build a make shift Co2 yeast system.....prob. not bringin' the ppm up 2 much... I used 6g active yeast / 4 cup sugar and water.... I can see it is working, hope its worth it....