Tony,
I too still have the bubbles under the media, but if I unplug the pump, they float up through the media. I'm starting to think we are maybe over doing it on the CO2 and maybe like you said the small bubble just join to make bigger ones under the media.
I'm really thinking of changing to a up flow system. Maybe with the pump inside the reactor.
Lee
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Need more time for the tank... Break a leg!
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