so, we had string algae as well as the fuzzy green stuff on all surfaces. Fish all ate it, but the pond didn't look great. We had a service call and was shown how we needed to clean off the copper leads. Did that and the service man recommended a product called SAB to clear out the algae. It did, but water turned brown. Then I added poly quilt batting to help clean out the brown. My concern now is whether I removed the main food source of the fish. I add fish food every three days.