1 1/4" tubing will fit that nicely. What I used for mine. As for if u need to or not.... I have no idea. I would be inclined to if it was still bubbling up, for 1) mess 2) i would think when the ferment starts to die back, some of those fluids that have been exposed might go back down, but that is 100 % guess, my 2 cents. This is my first so I really don't know. Jsut a guess.