I have updates.
Pond Filter: done. It took several extension cords and lots of tricky figuring things out to get it to work, but I finally picked up a GFCI extension cord at $homeimprovementstore and now it works. The algae got a little overgrown while it didn't work, but it's making progress on getting rid of that too.
Back Pain: gone.
Pond Stuff: pictures!
The fish pond part looks a little scraggly because I'm using it as a plant nursery until they get big enough to put elsewhere. The fish fertilizer is amazing and things grow.

This is the turtle area now:


And this is Turtle Island:

(The turtles have tried eating the silk plants but found they're not food so mostly have left them alone.)
And the waterfalls:

Hello turtles!

And my fence is kind of falling down; I have to go re-seat the bamboo poles a little deeper. A strong wind we had a few weeks ago loosened them and ... well, it's kind of started to collapse from there.

So there you have it. I've gotten it nice enough to put my umbrella up in the back and my little table to have a sitting area.

I'll do that later, though, because right now I have to finish the garage.