[header] How to control green pond water problems [title] Have only one inch of fish per ten gallons of water. [step] Your fish can affect the pond water quality. First of all the number fish should be according to the pond size because the organic waste will be more with more fish. 
[title] Avoid direct sunlight as green water is due to small algae cell. [step] When these small algae cells come in contact with sunlight produce algae by photosynthesis.