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What will turn pond water green?

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Quick Answer

Pond water will turn green when a large number of single-celled algae grow. When sunlight shines on the pond, it assists the growth of the algae.

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Algae grows strongly in the presence of direct sunlight and nutrients. This type of growth is a more typical occurrence in newly constructed ponds, as older ponds have a chance for the water chemistry to become settled. The main nutrient that causes algae to grow is nitrate, which is found in fish feces, dead plant material and left-over fish food. It is possible to prevent algae or slow its growth by not feeding the fish too much and cleaning out the dead foliage regularly. Another way to prevent algae growth is to have at least half of the pond covered with surface vegetation.

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