Hello

I'm interested in building an external CO2 reactor for my tank. Currently, i'm
using my power filter's intake for the injection site, but it's rather loud. I
plan to use the outake "T" of my hot magnum. The part used to drive an optional
add on biowheel. I could easily make an internal (gravel vac) reactor , but I
don't want to take up precious plant space (the tank is only a 29gal).
Questions:
Would this be too much pressure for a reactor? Is there such thing as using too
strong of a pump?
How do you mount the internal or external reactor?
What diameter PVC or gravel vac should I use.
Could some1 provide a link that has detailed pictures and tips 4 me?

Thanks!

N8