The Planted Tank Forum - View Single Post - Co2 diffusion??? DIY
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post #3 of (permalink) Old 11-08-2012, 07:39 PM
Planted Tank Guru
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 21,015
HOB filters tend to splash water with the return waterfall. This liberates the dissolved CO2, leaving you back where you started. If you keep the tank water level high, and/or use other methods for getting the water back to the tank with no splashing, that can work, but not nearly as efficient as other methods.

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