I have been planning a garden eel garden for a while now. The plan is for an extra deep, nearly foot deep sandbed so even adult eels can submerge comfortably. One question I can't seem to solve is how to keep the sandbed from forming pockets of Hydrogen Sulfide. Most guides recommend stirring the sandbed, but that would destroy the eel burrows. What are other ways I can keep the sandbed from forming large Hydrogen Sulfide pockets?