I've never made a bong so decided to try. First few things I thought about were what to use as stem, bowl, etc, etc. As I was thinking about how to make the bubbles smaller, it hit me... Use a aquarium bubbler! It looks like a little cylindrical rock with many little holes in it. Here's a picture Not the long ones, the short cylindrical ones. It fits snugly in the end of the hose (stem). Before I glue it all together, has anyone had any experiences with this type of thing? I know it'll make the bubbles smaller and will probably make the smoker cooler/smoother. Using this weekend (In 5 days) so I'll post results. Please post thoughts and responses.