RC51;
I purchased the AP100 pump two yrs ago to combat a low O2/fish-kill problem in my 3/4 acre pond. This was the lowest price I found for what I wanted. The pump will work down to a depth of 11.25 ft. I've had no issues with it since, and will be adding a second diffuser to help. You'll definately stir the bottom (as above C.Martin advice)


http://www.westernpond.com/aeratorStore.html#ap100kits