Update!
Well, I did it! I got the pond all cleaned out! It was pretty horrible on the bottom. There was a ton of black sand and blue rocks that just looked very unnatural. There was all kinds of rotten leaves and bits of mulch that had blown in. Dead snails clogging up the plumbing, lots of really foul smelling sludge, and filthy, filthy water. Poor Rambo. The muck was so thick on the bottom that he was burrowing down in there to hide.
So anyway, I cleaned it out, didn't scrub the algae too much, since the koi guy said to leave it. Basically I hosed it out, diluted the muck, and just kept scooping. I tried to use the pump to do it, but it was just too awkward, and I ended up spraying the electrical outlet and blowing the fuse! Oops! It was a hair-raising experience! Literally! :eek3: Moral of the story: Don't stand in a puddle barefoot and spray water into a socket!
I hosed out the water fall. There was a dead snail in the pipe, which explains why it wasn't working properly. I dug the sand out of the bowl part, and replaced that with larger pond stones that won't fall down into the pipes and clog it up. I also stuck the hose in there and blew out the junk that was in there clogging it up. It works so much better now!
So I cleaned the pond up, added in the (washed!) river rock to hide the bottom and weigh down the filter box. The pond was deeper than I thought when I got the muck out. 1 ft in the shallows and 2 ft in the well, which is good. I got my plants put it: 1 pot of black rushes, and a floating water hyacinth that Rambo seems to particularly enjoy. He really seems to like nosing around the roots.
I also did some cleaning and planting around the edges of the pond. I put in a maidenhair fern on each side where the falls get really splashy, and a wood fern a bit farther off to give some height. I have to say, I am really happy with how it is turning out. There are still a couple more things I want to do. I want to clean some overgrown baby tears (grown cover) off the flagstones and scrub off some if the algea. And I want to put a few more river rocks at the edges (kind of like mulch) to make it more grotto-y looking.
I haven't taken pictures yet, but I plan to this evening. I am so excited, and so far, Rambo is living up to his name. I'll be watching really closely. Hopefully he won't go belly up from all of these changes. He seems curious, though, and once we got him reintroduced, he was very busy swimming around and exploring the cleaned up diggs. I want to let it cycle and the add in some more fish so he can have a little school to hang around with.