Lots and lots of snails

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A few weeks ago I cleaned out all of the plants from our waterfall that leads to our koi pond, and this morning I noticed that the small rocks lining the waterfall looked speckled. So, I pulled one of the rocks out to investigate, and I discovered that there are many many small snails covering all of the rocks. (See attached images.)

Should I be concerned about this? Will they be trouble for the koi in the pond the waterfall leads to? If I should kill them, what would be the best way to do that?

Thanks!
 

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JRS

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Lots of folks have snails in their ponds and put them in deliberately. Good scavengers, should be fine unless they are eating your plants.
 

mrsclem

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With koi in there, the snails won't be a problem. I made one of my koi ponds to a lily only pond- no fish. The snails destroyed over 20 lilies. Tried several chemicals to get rid of them. Finally added a dozen feeder goldfish. Can't find a single snail.
 
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the layers of the food chain. take away the predator's and you get over run by something
 

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