barr internal venturi co2 reactor
I was thinking about building one for my twenty gallon, but I am not sure what power head to use. Does anyone have any suggestions? The smallest ones I looked at were around 80 GPH and that almost seems to much for a twenty gallon planted tank. I just don't want to make a mistake and buy a power head that is going to blow everything all over hells half acre. Suggestions on the appropriate power head would be appreciated.