08-27-2007, 01:50 PM
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Nice idea for the CO2 reactor, but I see problems with the sponge bottom (requires constant cleaning, retaining it in the bottom of the tube due to water pressure build up inside the tube, etc) and using a power head from the tank to provide water flow.
I have a 180 gal tank as the primary tank that feeds into a DIY 55 gal wet/dry tank. The later tank is where I want to mount my CO2 reactor and for the CO2 mixing to take place. In this tank I have all of my aquarium support equipment -- heaters, all filters, return water pump, etc.
One question I would like to explore is the use of a salt water PROTEIN SKIMMER for difussion of the CO2 into a FRESH WATER aquarium. There are several cheap Protein Skimmers available for $25 or less that can be modified for this purpose. A major advantage to using a Protein Skimmer is that they have a diffusion plate built in to the chamber, bio balls can be added to futher diffuse the water if needed, they are easy to clean, and the "plumbing" is part of the skimmer. A water pump would be required for this purpose but it can be tailored for the water flow and diffusion rate you want.