I appreciate all the good replies.

I agree buyers just not much you can do to control water temperature.
So I’ll focus more on the DO factor to keep that more above 6 round the clock if possible.

I would love to deepen the pond. I have no idea how you’d even do this though.
If under $10k I’d probably have that done right away. As long as the current fish could survive it.
But I guess in reality the pond needs completely draining.

Shifting my focus to aeration.

Thanks all!

Jay