What kind of Fish eat Leeches?

I am thinking about creating a large pond in our yard and do leeches go in the pond or are they created some how? And can guppies and Koi's survive together? i have 200 guppies exactly and 30 kois from can they live together? and can kois eat leeches? Please i need answers. I Am mostly worried about disgusting... show more I am thinking about creating a large pond in our yard and do leeches go in the pond or are they created some how? And can guppies and Koi's survive together? i have 200 guppies exactly and 30 kois from can they live together? and can kois eat leeches? Please i need answers. I Am mostly worried about disgusting leeches.
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