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DIY CO2 Reactor Problem

I have constructed a CO2 reactor out of a powerhead, a gravel vacuum
tube, some 1" bioballs, and a limewood airstone. The problem is that
after a couple hours of running so much air builds up in the reactor
that there is a 1 - 2" air layer at the top. Is this normal, and how can
I prevent this other than emptying the air every hour or two?


Jerry Baker