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>From: "Roger S. Miller" <rgrmill at rt66_com>

>Plants produce an oxygen surplus only during the day while actively
>photosynthesizing.  At night they compete with the fish and *use* oxygen
>to metabolize the sugars produced during the day

So is it advisable to cut off CO2 injection at night? What's the cheapest
gizmo that would do this automatically on a DIY system? Something
that would open and close a release valve on the tube so the CO2 
goes into the room instead of the tank.

Cliff Lundberg  ~  San Francisco  ~  cliff at noevalley_com