Question for the pump, mine came with 2 barb things like this. http://i1221.photobucket.com/albums/dd462/dukester_/IMG_4785.jpg
If I wanted to put vinyl tubing for the output should I cut off the tip that isn't the right size? or do I just slide the vinyl tube over it and clamp it where it'd be snug?
you cut of the tip not used or you just have a restriction. Chances are you won't be reducing the size of your return line.