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I have two JBL CO2 supplies/reactors in a tank (5ftx2ftx2ft). Unfortunately I cannot spend out this month on two JBL solenoid switches which could be timer controlled to shut-off the CO2 during the night and then switch-on the CO2 a hour before the lights come on.

Instead, I have an air pump with two outlets on a timer, this switches on at intervals during the night to help break the surface tension and allow Oxygen exchange at the surface; but is this enough?

Has anyone else dealt with this problem in a similar or totally different way?

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