Filamentous algae grows due to excess nutrients in the water. So a lot of rain and a good deal of outflow from the pond could have reduced the nutrient level to where it isn’t growing any longer or at least until nutrient levels build up again
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May you be blessed with plentiful game in the fields, the time to hunt, a good bird dog in front of you, a Parker in your hands and friends to share the adventures with.
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