Green Algae in Your Goldfish Pond

How to Remove Algae

Green algae blooms when there are sufficient nitrates in the pond water and plenty of direct sunlight. The long hot daylight hours in the summer are ideal conditions for green algae to thrive. Just like the green algae in goldfish tank water, these algae outbreaks can come in many different forms and cause problems in your goldfish pond.

Types of Pond Algae

The green ‘pea soup’ water conditions that cause algal blooms are single celled forms of algae. When this shows up in your goldfish pond, it is a sign of poor pond water quality. This happens in new ponds Poor quality water in a goldfish pond can be caused by excessive nutrients in the pond water due to over feeding, overstocking with fish or a lack of biological filtration.

Blanketweed is a species of filamentous algae that resembles strings of thread or silk. In a goldfish pond, It will clog up the filters and air pumps, cover the aquatic pond plants that help produce oxygen. Some blanketweed in a goldfish pond is not a serious problem but it soon can become a nuisance in a well lit pond with excessive nutrients and a lack of aquatic plant life. Completely eliminating blanketweed can difficult due to its ability to adapt and become resistant to certain chemical treatments.

Remove Green Algae

To cope with an green algae bloom reassess your feeding regiment, and stocking levels. This usually mean you need to cut back on feeding. Add more aquatic plants or amphibious plants to out compete the algae for the nitrates in the water. It’s important to note though, at night time, aquatic plants compete with your goldfish for the dissolved oxygen in the pond water and during summer months there can be low oxygen levels. Waterlilies that float on the surface of the pond will shade the water and discourage green algae blooms from growing.

Ultra Violet Light Pond Water Clarifier takes pond water recently passed through a pond filter into its own tube opening that contains an ultraviolet light . The ultraviolet light helps breaks down all the algae cells in the ponds water by continuously circulating water past its ultraviolet light. Passing the water first through a filter helps keep other particles out that might shelter the algae cells or clog the tube of the ultraviolet clarifier.

Barley, lavender, wheat, linseed, and oil seed bags are often used an algaecide in goldfish ponds. Barley straw bags are considered to last the longest and is recommended over other products. The decomposition Barley straw
iconreleases compounds that inhibit the growth of certain types of algae. It doesn’t kill the existing blanketweed but keeps new algae from growing. If you find these bags to be an eyesore, try a barley water clarifier

Pond algae magnets break up the calcium carbonate in goldfish pond water which then weakens the the cell walls of blanketweed. Since blanketweed can become resistant to treatments, it is recommended to cycle the pond algae magnet in and out of the pond for a few weeks at a time.

Electronic units act similar to algae magnets by creating a static magnetic field that controls blanketweed. These too should be used intermittently. However, high-end models will periodically change the polarity strength which makes it hard for the blanketweed to adapt to the constantly changing conditions. Electronic blanketweed controllers are safe for use in goldfish ponds that contain aquatic plants since aquatic plants have thicker cell walls.

Chemical Algae Control can be used in combination with these other treatments and be used intermittently so the algae doesn’t become resistant to any one treatment.

photo credits: unforth

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