Fish kill definitely due to DO depletion. Thunderstorms for 5 days, no aeration, heavy algae bloom ,3 feeders, abundant TF shad & BG without aeration I experienced a perfect storm. With new aeration systems in place ,I hope to prevent DO depletion in the future.
I was hoping to find an 02 meter that is user friendly that would let me occasionally monitor O2.

Thanks to all Pond Boss folks for your help,

Al Allison