If the snails are not harming the plant life you might as well keep them
and be glad for them. Snails will help keep some plants free of hair
algae.
If you want to cut their numbers down, try sunfish. Or maybe a few young
turtles. When the turtles get bigger you'll have to remove them because
they start eating plants.
Or put peices of lettuce in the water to attract and trap them.
The Ramshorn snails are the more desirable species to have around if you
just aim at thinning the population.
Jeff
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