DIY-ers and non-solenoid controlled CO2 users can "turn off" your CO2 diffusion by feeding the CO2 tube into a small inverted powerhead that is connected to the light timer.joephys said:Well, I have DIY, so I can't turn it off. I guess it runs 24/7
After switching to a drop checker to monitor CO2 levels I have noticed that when running the CO2 24/7 the reading is the same 24/7 there is no change from lights out to lights on. My theory is that the plants use and produce such a small amount of CO2 compared to the amount we put into the tanks that it doesnt actually change the overall CO2 level in the tank. the out gassing of CO2 into the air is by far the largest user of CO2.During the day when plants photosynthesise they use Co2 and emit o2 as a by-product. At night when the plants are 'asleep' they switch to a reverse photosynthesis, using o2 and emitting Co2.
If you keep your compressed Co2 on at night you run the risk of overdosing your c02. Have you ever noticed your fish swimming or gasping at the surface in the morning? fish that usually stick to the bottom regions, swimming up to or hanging around the surface in the morning? Chances are its a Co2 overdose.