I think this stuff, especially the floating algae, is pretty normal. It usually disappears after a rain. If you took all of the cottonwood junk, put it in a bag, and wetted it down, it would be pretty small. No problem.
However, if the cottonwood is next to the pond, it will drink a lot of water.
It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.
Without a sense of urgency, Nothing ever gets done.
Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa
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