In an ongoing effort to help people with green water and pond algae problems, it would be a mistake to not include the influence of fish in the equation.
In smaller ponds fish probably have more of an impact, both positive and potentially negative than anything else. On the positive side, few things can bring life and vitality into a pond any more than fish. If they’re colorful, you’ll find a rainbow of cascading colors shimmering under the water. It’s a beautiful thing.