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I too turn my Co2 off at night (unfortunately I'm also a procrastinator and dont yet have a solenoid so I do it manually) I mainly do it to conserve the gas.
 

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Keep an eye on your fish if you dont have an indicator that will let you know at a glance what your levels are, if they start all (or even a particular species or group) hanging around the top surface of your water you may have too much CO2. I would not use this as a primary way, but I have noticed that when my levels get up a bit and my indicator starts getting a tint of yellow many of my fish start hanging around on the surface.
 
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