More than likely, these BG are CNBG, I'm guessing..
I'm highly suspicious that a fast "rate of change" is more than likely the culprit here. The rate of temperature change is more of a factor than the actual temp.
I keyed on one other item you mentioned.. "algae on the fish"... are you sure this isn't fungus that has taken on an "algal" color?
I'm personally leaning in a direction of a stress kill more than anything else. Not saying low DO wasn't an issue, maybe a contributing factor but you went through, as you said, "the worst conditions in 100 years"..
Last edited by Snipe; 03/08/21 01:09 AM.
