Thanks esshup, for the point of water temperature & species sensitivity. I'll read up on tilapia [in Colorado].

Will it do any good to embark on removing the really thick FA right now this late in the summer? Or ought I wait until spring again to really take all measures against algae that I can?

Yes, as someone else posted here recently, I get that turning around a pond doesn't happen quickly, but adding algae-eating fish, perhaps even more aeration, scraping LOTS of floating FA off, etc. would make a difference any time of year, but I gather mainly in the spring.

I'd think there is no bad time (using commonsense) to do any pond maintenance. As I've read, any is at least something.