I guess I haven't figured out how the controller makes anything safer. If
the probe goes out of calibration it could cause the controller to call for
more CO2.

The cure for CO2 end-of-tank dumps is a needle valve working against a
pressure head.

There seems to be a difference of opinion about the value of removing CO2
input during the night but it is easy to do either by cutting of the flow or
reducing the effectiveness of the diffuser during the night.

Simple sounds best to me.

jtm

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