I'm now injecting Co2 via an in-line reactor into my 40 gallon. I've read your recent Co2 article and threads since then and I have to admit to some confusion (probably my denseness) as to what method you currently think is the best way to go. Are you recommending
1. a ceramic disk diffusor (such as the Eheim, Boyo or Azoo (do you have a preference?)) under the spraybar or
2. Using an internal venturi reactor such as you've got diagrams on this site?