So I made a Yeast bomb co2 thingy for my aquarium last night. I used an air stone to make some fine bubbles and noticed the bubbles attaching and building up on the soft silicone air line. It's my understanding that the longer the bubbles are underwater the better absorption I'm getting. So i thought how could I force those bubbles to stick all up and down the air tubing? It just happens that I had a 12in piece if clear acrylic tubing in the garage that is just a hair bigger than the air stone. I slid the air stone and tubing into the acrylic tube all the way to the bottom like an lift tube on an under gravel filter and stuck the bottom of the tube into the gravel. The bubbles are rising very slowly and the air tube is totally covered with co2 bubbles. Hopefully this will help with absorption.