Yes--I have 2 9" diffusers spaced apart in my shallow, sort of triangular pond and have never even seen a dead fish until yesterday and today. My guess is that the sudden heat wave and the decaying duckweed caused a perfect storm. This is an old pond and since buying the property last fall, I've been trying to do what I can to reduce muck, boost oxygen and clear up the unwanted duckweed and FA. Our primary intentions are casual fishing and, hopefully some day, swimming. Right now I'm pretty disgusted and discouraged.
