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Algae occur both in the aquarium and in the garden pond. They are usually recognized by the green discoloration of the water. In such a case, a water change is best, at least a partial water change.
This means for the fish and other living things in water absolute stress. This can have a negative impact on them.
Blue algae - are the most annoying algae. If they proliferate, they cover the soil, plants and decoration with a slimy, foul-smelling mass. Smother the plants. Some species also excrete toxic substances that can be dangerous to fish.
Dinoflagellates - are usually introduced by invertebrates or stones. They multiply in a flash and in masses.
Gold algae - are also introduced, but do not spread like that.
Green algae - there are many different types. The fight is difficult. Well, algae-eating fish help. Green algae are usually responsible for the lighting conditions.
Floating algae - belong to the green algae. They can be combated with UV-C rays.
Diatoms - form when silicates enter the water, which provide the diatoms with good growth conditions. If the silicates are all, the alga usually disappears.
Red algae - are particularly common in heavily filtered water. A throttling of the filter performance is recommended. Infested plants should be removed.
String algae - usually occur in very clear pond water. They form large carpets and lumps in all water depths. These can clog the pump filters. You can fish them or use chemical agents.
With bacterial cultures algae can be easily controlled. It is important that these bacteria are not pathogenic. They should restore the biological balance in the aquarium or pond.
A good mixture of bacteria and enzymes ensures that decomposition and accumulated excess food are broken down. No harmful gases are formed for living organisms. The water clears and so the biological balance is restored. The algae get no food and disappear.
A side effect is that the bacteria destroy some species of fungi that can attack both fish and plants.
Aquatic plants and algae-eating fish
It is favorable to use fast-growing underwater plants and floating plants. As food competitors of algae, they serve well. The plants consume the nutrients for themselves, so there is not much left for the algae to spread quickly.
If you use algae-eating fish, you should not feed them too much. Otherwise, it may happen that they have no appetite for algae or are just too lazy to work. Also, do not allow too many fish in the pond or aquarium. The fish use should be adapted to the size of the pond or aquarium.
Modern filter technology
Pond vacuums can remove the pond mud in the pond. So the algae also have fewer chances to multiply. Overall, modern filter techniques help prevent algae. But it will probably never succeed.
Algae-free with ultrasound
In the animal kingdom many animals such as bats, whales or dolphins use ultrasound. With their help, they hunt or orient themselves. In the pond or in the aquarium, the ultrasound generator emits similar clicks that tear the vacuole of the algae. The alga dies from stress. The method can be used against existing and new algae. It not only eliminates algae, but also biofilm without any chemicals. This algae control is environmentally friendly, ecological and economical.