Remove red algae and fight it permanently


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Remove red algae and fight it permanently: permanently

If the garden pond turns reddish, red algae are usually at work. The red algae are algae that take on a red color through photosynthesis. The group of red algae includes the bearded algae and brush algae. If the pond is contaminated with the red algae, the cause should be eliminated in addition to the control of the strong algae growth. Recognizable is a red algae attack on the reddish and cloudy discoloration of pond water. In the worst case, the oxygen concentration in the pond water can sink so much that the fish suffocate in the water and the pond tips over.

Causes of red algae in the garden pond

  • Red algae are common in heavily filtered pond basins.
  • If there is also a CO² deficiency in the pond, the disturbing algae multiply very quickly.
  • Furthermore, a high nutrient content in the water (increased nitrate value and phosphate value) leads to an increased growth in the garden pond.
  • In addition, red algae are characterized by the fact that they show great growth even in good light conditions.
  • For this reason, they are also often found when a garden pond is exposed to intense sunlight.

Mechanical combat

First, it is advisable to mechanically remove the red algae. In addition to red algae, infected plants and leaves should be removed from the pond and replaced with new ones. Also important is the CO² value of the water: this should be between 10 and 20 milligrams / liter and can also be increased to 30 milligrams per liter of pond water if the pond shows strong algae growth. As long as the nutrient combination in the pond is balanced, plants and animals live in peaceful coexistence. But if the phosphate content increases, the red algae multiply, because their living conditions improve. Rising water temperatures and increased sunshine can lead to a veritable algae bloom. Responsible for the growth of algae is also the iron content of the water. Regular water changes should be carried out in order to banish the pests from the garden pond in the long term. Also, the amount of water in the garden pond should be increased if possible and kept constant.

Renovation of the garden pond

Red algae can also be removed by a pond renovation and fight sustainable. The Mulmschicht on the ground consists of fish droppings and decayed plants. This must be carefully removed and replaced with new Teicherde. It should be ensured that the new Teicherde is nutrient-poor. All plants are generously cut back and shared. Subsequently, the plants are replanted into the nutrient-poor pond soil. Also embankment mats or plant baskets can be used.

Lower phosphate content in the water

Nutrients and phosphate pass through excess food of the fish and fish droppings in the garden pond. Fish droppings and feed sink to the bottom of the pond and are decomposed into its components. In heavy rain, nutrient-rich garden soil and lawn fertilizer are additionally flushed into the pond. Likewise, leaves that fall into the garden pond contain phosphate and other nutrients that promote algae growth. In order to reduce the growth of algae and to combat them sustainably, the pond water should be deprived of nutrients. In addition to the algae, the plants also need nutrients in the water. The more aquatic plants live in the pond, the faster the nutrients can be bound by the growth of the plants. Unfortunately, an increased algal infestation is the result. Aquatic plants that are not affected should therefore be severely and regularly cut back. The regular fishing of red algae also reduces the nutrient content in the pond water. A mineral binder (phosphate binder) ensures that the phosphate content in the pond water is reduced. Nutrients can not be absorbed by the red algae due to the phosphate binder as they are bound by the chemical process.

Increase and pond drainage

In order to remove the red algae sustainably and to obtain clear pond water, it is important to eliminate all phosphate sources. Already at the plant of the pond the course can be set. The waters are most naturally in a depression. However, this situation carries the risk that mineral fertilizer or garden soil are flushed into the pond. A slightly increased space here provides a remedy. If possible, the garden pond should be surrounded by a drainage ditch approximately 60 cm deep, which must be filled with gravel with coarse grained sand.

Lighting conditions and water

Sunlight promotes algae growth. A location in the shade prevents the attack of red algae. At least two-thirds of the pond should be in the shade. Water depth and amount of water also affect algae growth. The flatter and smaller the water, the greater the growth of algae.

Water Lilies - Nymphaea


Tested tap water is best for filling the pond. Often, however, the tap water contains up to 5 milligrams of phosphate per liter of water.Here you should ask and use a Phosphatbinder with an increased phosphate content. Groundwater is usually better for filling the pond, because it is low in phosphates.

Proper care

Nutrient-rich deposits can also form in seemingly clear pond water. Special pond sludge sucker provide a remedy. Regular suction ensures lasting protection against red algae. In addition, the pond should be protected in the autumn months with a network, so that no leaves get into the pond. Furthermore, it is advisable to remove floating foreign bodies such as pollen etc. regularly from the pond surface. Here are "skimmer", with which the water on the surface can be easily sucked off. If there are fish or other aquatic animals in the pond, their excretions can increase the phosphate content. As long as no fish food is added, the natural balance in the pond is maintained. But if the pond is regularly supplied with fish food, it receives additional nutrients, which promote the tipping over of the pond. Fewer fish can feed themselves in the pond. Here it is advisable to reduce the number of fish or install a filter system that removes excess nutrients and algae effortlessly. To remove red algae sustainably, extensive measures are necessary, which overlap and are to be carried out regularly.

Worth knowing about red algae shortly

  • The different species of red algae have their habitat in fresh and salt water.
  • In the aquarium you will find mainly two species of red algae, namely the bearded algae and the brush algae.
  • In the saltwater aquarium, on the other hand, there are a large number of different red algae species.
The difference in the occurrence of red algae in the freshwater aquarium to occur in the saltwater aquarium is that they are often desirable in the saltwater aquarium, because they occur there in a variety of shades of red and thus cause a beautiful effect. However, the species found in the freshwater aquarium are more likely to show gray to black, so there is no question of a nice effect. The affiliation of the brush and bearded algae to the red algae can be recognized only with the help of alcohol. If you put these in there, then their bright red color comes to light.
Unfortunately, brush and bearded algae are one of the most common and persistent algae found in the aquarium. What factors must work together so that the red algae can develop in the freshwater aquarium, is still unclear. The only finding that has been made with certainty is that red algae feel most comfortable in heavily filtered aquariums. If this comes to worse plant growth, the red algae often and regularly to a real plague.
  • Like any kind of algae infestation, the red algae are prevented by frequent water changes.
  • To counteract an oversupply of nutrients, one can use fast-growing plants.
  • But it is also important that not too many fish live in the aquarium.
In this context, it is important to ensure that not too much food is offered, which does not absorb the fish for lack of hunger. Since the beard and brush algae prefer heavily filtered water, you should shut down the filter performance.

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