Anyone can appreciate that fish are a stunning pet and feature to have in a garden pond.
However, choosing the best fish to add to your pond is only half of the job. You have to add the right quantity. Those of you who are overstocked with the amount of you keep are destined for disaster! More fish in the pond means more natural biological processes. Fish then produce more faecal waste that forms the nutrients required for green water to occur.
How many fish can I have in my pond?
Research the amount of fish suitable for the volume of water in your pond. By keeping a decent amount of fish for the size of the pond, you prevent an overload of waste and reduce the nutrients available to trigger the growth of green water algae.
Similar to overstocking fish. If you have a decent amount of stock but have a habit of overfeeding them, you’re likely to introduce excessive waste into your pond. Not only from the natural biological processes of fish but from the food that isn’t consumed.
What happens to fish food that’s not eaten?
Leftover fish food decomposes in the pond and turns into waste that also fuels the growth of green water. If you notice that your fish aren’t eating all the food you give them, reduce the amount and feed them enough to make sure there’s nothing left behind.
This is most likely to occur in your pond during winter months when fish have a reduced appetite.
Green water causing algae are plants, and like any other plant, they love sunshine. This is bad news for any pond that isn’t sheltered from the sun. Sometimes building a pond with shade isn’t ideal, but there are still ways of providing some degree of it.
What pond plants are good for shade?
Aquatic plants such as water lilies which float on the surface are a great method. They provide partial shade to reduce sunlight exposure not only to algae but for fish such as Koi, which can be sensitive to sunburn. Plants such as; marsh marigold, water hyacinth, water forget-me-not, water mint or water lettuce.
As mentioned before, green water is caused by single-celled plant organisms called algae. This organism typically occurs when there is an imbalance (high amount) of nitrates and phosphate levels in pond water providing algae with the nutrients to grow and in perfect conditions, thrive! These nutrients are elevated via some of the points mentioned above, however, can be eliminated with the use of a beneficial bacteria treatment, such as Pond Klear and Filter Feed.
Pond Klear works by binding together and consuming the green algae particles, along with all the fish waste, dead leaves and organic matter that form the algae’s source of food. Pond Klear, therefore, prevents green water algae from growing.
Aeration devices are a useful way to increase the amount of oxygen in your pond that helps beneficial bacteria to break down and eliminate green water algae.
Does more oxygen reduce green water algae?
By increasing oxygen levels, they also promote the reduction of carbon dioxide. So, the algae have less food and grow at a slower rate. Great aeration device choices are water features such as waterfalls, fountains or even pump and filters.