I like diffusors

[Dave Millman <dave at tactics_com>]

With all the discussion of CO2 diffusion techniques lately, I just wanted 
to weigh in with mine:

I really like the PlantGuild Products Power Reactor. I got mine with a CO2 
system from www.floridadriftwood.com and I know that www.aquabotanic.com 
carries them as well.

Advantages include:
    * Integral bubble counter: you can count the bubbles as they
      enter the reactor
    * Works with any kind of filter-no problem if you don't have
      a power filter
    * Silent
    * Efficient