Pond Scum

[Quillback]

The best natural solution seems to be grass carp.

We've got those also, but they can't seem to control it by themselves.

[Outside Bend]

Grass carp are really good at grazing down rooted aquatic plants like coontail, but typically won't eat much filamentous algae. If you go that route, it's wise to stock light. Those young grass carp will someday be 15-20 lbs, with pretty hefty appetites.