This may sound crazy but I like some of the stuff. I do know it will show up in a week if you blow the grass clippings from cutting your grass or whipper snipping the pond edge.

Lots of good life lives in this stuff but what you have I would say is a problem.

Just start scooping.

[Linked Image from corvettejunkie.com]
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7/8th of an acre, Perch only pond, Ontario, Canada.