well what i did was even though most of the bubbles are very small from the diffuser, i left my ladder in for now and kept the tubing running down my ladder(helps keep my diffuser in the sand)just extended it so it can reach down far enough so my diffuser sits in the sand but i noticed the bubbles are coming straight up and goind under the bottom step of my ladder and traveling up the ladder as it does originally except these bubbles are already very tiny and the result is i now have very very very small bubble traveling up and even furthermore dissipating. hope my rambling made sense. i will try to post a photo. might help get even more co2 into the tank.