08-29-2014, 04:41 AM
Join Date: Jul 2013
Location: McKinney, TX (Dallas/DFW)
| | Re: Co2 diffuser for the 75 gallon.
For any tank that has a canister, I would go with an in-line reactor. They can be easily made, or you can buy them prefabricated.
Most work on the principle of reverse flow. The water flows down a column while the co2 tries to bubble up it. The counter currents can quickly dissolve 100% of the co2.
Do a search for Cerges' or Rexx Grigg's designs. I made a Rexx, but the Cerges looks much easier, and possibly reusable since it uses a standard 10" water filter housing.
I would only use a diffuser on a small tank that only has HOB filters.