We just bought a house a couple months ago, and there is a little pond. Since I have been here I have added algaecide to the pond but that is about it. Empted the little fiIter cloth thing. Prior owners said they stop putting koi in because the raccoons just ate them everytime once they got to where they could not hide under the rocks. I know nothing about ponds!!! This morning I noticed some little white worms that are red at the end. I do not know how to take care of this problem. Do I cut this off for winter or put something in it for it not to freeze? I do have a little net to put on it to catch the leaves. I will attach some picture so hopefully someone can tell me where to start. Is there a filter I change every so often? I'm lost lol.. please help