How do you control algae in a fish pond?


Quick Answer

To control green algae in a fish pond, install a filter, minimize the amount of organic runoff entering the pond, vacuum debris from the pond bottom, and avoid overfeeding the fish. Add floating aquatic plants to the pond, which aid in filtration by removing excess nutrients from the water. If green algae persists, install an ultraviolet sterilizer.

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Full Answer

Green algae blooms in a fish pond are the result of excess nutrients in the pond water. This is typically due to organic matter entering the pond, overpopulating the pond with fish and their resulting waste products, or overfeeding the fish. Green algae is often a problem in a new pond that has not yet established proper biological filtration to balance the load of plants and animals.

Install a biological filter, a pump to move and oxygenate the water, and a skimmer to remove debris particles. Add only as many fish as the pond capacity allows, taking into consideration the fishes' future growth. A good guideline is 2 inches of fish per square foot of pond space. Add fish slowly over a period of no less than a month to allow the biological filter to adjust to each addition.

Avoid adding excess nutrients to the pond by reducing organic runoff from lawn fertilizers, skimming leaves from the surface before they sink and become sludge, vacuuming sludge at the bottom, and not overfeeding the fish. Commercial products, such as Algae Fix, are available to remedy persistent green algae blooms.

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