Should I leave a dead fish in my aquarium for the snails to eat?

[SerendipityLee]

I just finally noticed what happened to a missing guppy fish in my small aquarium. It died & I noticed many of my small snails feeding on the dead fish. I know a dead fish is bad to have in a tank, throwing off the chemistry. I have no idea how long it's been dead. Should I let the snails finish eating it? Or remove the carcass? Thanks!