What can you use in a stagnant pond that wont hurt ducks or chickens?

In a stagnant pond, you can use natural treatments like barley straw, which helps reduce algae growth without harming ducks or chickens. Additionally, introducing beneficial bacteria can improve water quality by breaking down organic matter. Floating plants, such as water lilies or duckweed, can also enhance the ecosystem while providing shade and habitat for wildlife. Always ensure that any products used are specifically labeled as safe for aquatic life.