Jon I would like to start this by saying that your article was great and very informative.
But before I tackle a project of building my own protein skimmer I have a few questions for you. The first question is when using flanges to connect tubing, what keeps water from leaking at the flange? Should a gasket be used there? My second question is I would like to have a 1/2" or 3/4" tube come out of the side of a 3" tube that will be used for the injection/discharge in the protein skimmer. What is the best way to do this?
Thanks, Bob

Thanks, Bob