Sorry for the delay on any update. I've been busy trying to clean up the pond. In total I have removed about seven 5 gallon buckets FULL of fish. All different sizes, mostly BG and LMB. There where very few BCP, about a dozen. Things I noticed during the cleanup.

1. The water is very murky. Typically my water is very clear. It went down to 10" of visability and now it is about 20".

2. While in the pond I did notice quite a bit of black nasty bits along the pond edge and on the weeds.

3. Bad smell. Not sure if it's all due to the rotting fish or the black sludge.

4. I did notice large schools of fry swimming while cleaning up the dead ones on the first couple of days. I didn't see them yesterday but I will check tonight. I have not seen anything larger.

5. I still have several bullfrogs and bullfrog tadpoles. Didn't see any dead ones.

So here is my theory. I don't have data to back it up but .....

My pond is 30 yrs old. Aeration was added just before I purchased it in 2014. The aerator is a Gast 0523 (4.0 CFM @ 10 PSI) with only 1-9" diffuser at the deepest spot. The pond has quite a bit of leaf debris as the property is all wooded, I have removed most of the trees around the pond to reduce this. Every year the muck layer seems to be reduced. I also remove FA whenever I can. Each year seems to be getting better. Prior to this happening we had several cloudy days and then a heavy cold rain event. It looks to me that the pond turned over rapidly which caused the problem. I think what I am going to do is add another diffuser and run 24/7 until the water gets too warm. Would my pump handle two diffusers with one at 17' and 1 at about 14'? I have 3/8" sinking line.

Thanks,
GKLOP