Pond update from my post in '13. I ran out of bacteria supplement last year ('14) and got lazy and didn't get any more. By the end of this Summer ('15) the muck is definitely worse and I'm having algae blooms. Have been running the air 24/7 for the last couple of years. I know the diffuser is dirty and what used to be small bubbles are now big ones but it's a small pond (20'x40') and other than that the only change has been the stopping of bacteria additive. My hope and plan is to somehow try and tackle the muck (again) with a pump or small DIY type dragline and then start up bacteria and air again.