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I've also always thought that the "natural looking" rock bottom pond looks not really natural. The only "ponds" I've seen in nature that have rocks in them are pools in mountain streams in the Sierra Nevada's. Beautifully crystal clear right down to the granite stones. But no fish...a few water strider's in the calm areas, but never saw fish in them.
And of course the bottom stays clear because it's scoured clean each spring by the enormous floods of melting snows. Which also cleans them of most life.
Slow moving ponds that I've seen in nature, may have some rock around the edge from water eroding the soil away, but that soil goes down to the bottom and mostly stays there.
The bottom is usually a oozing sticky mud. And there is lots of life, water bugs, frogs, turtles, minnows and maybe a very few hearty fish such as sun fish.
Still very few fish compared to the total gallons. A natural pond also is usually flow through, new water comes in from streams and old water leaves the same way.
Plus all this life is also usually temporary, as a pond too is flushed with annual spring flooding, lots of life is washed down steam, and the whole life process starts again in summer.
Mud ponds for koi are also drained every year and the muck scrapped off the bottom, limed for disease prevention and refilled. Plus they are also usually flow through.
I think of a "koi pond'' as a kind of in ground giant aquarium. It can be made to look natural with clever design and landscape
( see the link on Japanese ponds at Koishack that Nancy posted earlier) but underneath that lovely facade is a true waste treatment plant. Nothing natural about it really. But it works.
I've always wondered; has anyone posted a pic or talked about how well their rock bottomed pond is doing that has been in 20 years, 10 years, 5 years even?
The best I've seen are always new ponds, a year or less. Unfortunately they are a system of diminishing quality. Even with clean outs. If someone out there has one older than 5 years that hasn't gone south, I'd be very interested in seeing it.
Joel, you have a very lovely pond, and no one is trying to pick on you. They are just trying to prevent your future heartbreak. It's too bad though; your future personal experience might be what you ultimately learn from. I hope not.
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