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Water is the most important element for aquatic plants, fish and many invertebrates. 

Over the course of evolution, they have perfectly adapted to the conditions in their wet habitats. Through their skin and their gills, aquatic animals are in direct contact with the wet element that surrounds them with their skin and their gills, taking up vital minerals and get rid of waste.

Plants do the same with their leaves.

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The quality and composition of the water have an enormous effect on the health and well-being of the organisms living therein. A closer look at the biotopes of ornamental fish, aquatic invertebrates and plants reveals that they are by no means uniform; every landscape has one or several typical types of natural waters. 

Not all water is the same 

In most tropic and subtropic regions from where our aquarium fish and plants originate, the water is usually low in minerals (soft) and rich in humins, containing a high level of carbon dioxide and no pollutants whatsoever.

Dead animal or plant matter is quickly decomposed by fungi and other microorganisms. The minerals, trace elements, and vitamins produced during this process nourish other organisms.

In spots with nutrient-rich seepages, you can find lush plant populations. 


No natural habitats of our aquarium animals are without humins.

Water conditioning 

In our aquaria we ought to mimic the natural habitat of the animals and plants we keep as closely as possible. Appropriate water parameters, a balanced aquarium, are not only the basis for healthy, colorful animals and plants, they also enable us to have an unhindered look into this impressive aquatic community.

Aquaria that are biologically stable are quite close to the demands of a species appropriate, animal-friendly habitat.

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In the course of our more than 50-year company history, we have developed a deep understanding of the biological complexities in the aquarium. The most recent result of the Dennerle R&D is a compact water conditioning program that contains everything you need to turn tap water into natural water just like in the biotopes.

We want your animals and plants to be well, and help you promote the biology inside the aquarium optimally. There’s no need to use all conditioners at the same time. Choose those that make sense for the current state that your aquarium is in.

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Basically, there are two groups of products: 

One group consists of products that add desirable substances present in the natural habitats, but are otherwise missing in tap water or are easily depleted. Examples from this product line include Humin Elixier and Vital Elixier

The other group contains products that remove undesirable substances that are not present in the natural habitats. These substances can sometimes be present in tap water or can be created inside the aquarium through the course of biological processes. Some of these products include Aqua Elixier Moringa, Bacto Elixier FB7, and Clear Water Elixier.

If your tap water is not suitable for the plants, fish, or inverts you would like to keep (e.g. the water is too hard), RO water mixed with a special re-mineralizing product is a real and simple alternative to tap water.

Add the proper mineral salt to the water in a container outside your aquarium before you add the water to your tank. 



Water change 

Most of our aquarium animals originate from running waters or lakes. In nature, a constant water change takes place. New water is added by rain, sources, and tributaries all the time.

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An aquarium, on the other hand, is a closed system. Through food, nutrients are added on a daily basis. The animals contribute to the rise in concentration of organic and inorganic pollutants through their metabolic processes. Algae feeds off this excessive waste. Even the most efficient filter is powerless against some of this waste.

Growth-inhibiting pollutants may accumulate, bringing plant growth to a halt, despite the manual addition of fertilizer on a regular basis.

In an aquarium, new water is only added to the system through a partial water change. This regular refreshment is one of the keys to a well-functioning system.

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Your fish, shrimp, and other fauna will stay healthy while pest algae won't stand a chance. 

For this reason, we recommend that you siphon off 20-50% of the aquarium water and then replace the same amount of fresh water at roughly the same temperature.

If necessary, treat your fresh water with the proper conditioners before you add it to your tank. 



Continue reading about: Nutrients for Plants

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