Thanks for your thoughts!!!

I assume getting some aeration would help a lot, as would pulling some fish out.

Getting out of the high 90s wouldn't hurt either.

I have quite a few turtles - some small to medium sized turtles swim over and compete for fish pellets, but I've never seen them bite, mainly they get shoved under by a ton of catfish converging on them.

Anything else, especially that can be done quickly/cheaply?

Salt?