Snails, slugs and frogs come along with those water lilies. My dad's pond always used to have these little froggies who thought it very polite to hop in and say Hi any time of the day.. this used to freak my mom out while we kids kind of enjoyed the sight..
@Claudine, yes you definitely want snails, especially if you use a metal or ceramic container. Just like with an aquarium, the snails will help to keep the algae down in the pond, otherwise the water will be really nasty after a while. There is also a fish you might want as well, it's called an algae eater, though I think there may be more than one variety.
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