Change of the water over time
The water in rivers and lakes, but also in the sea, changes in the course of the year. Sometimes spontaneously through downpours or floods, but mostly periodically recurring through the seasons. There are various parameters that change in the process. These include transparency, conductivity, organic content and also the amount of nutrients available.Tap water is not equal to aquarium water
Without an appropriate source water, sensible aquaristics is hardly possible. In many cases, the combination of tap water and aquarium can work well, but for the provision of optimal conditions for individual fish, invertebrates and plants, the German Drinking Water Ordinance can not be used. Many parameters that stain tap water, such as trophic substances or coloration, are completely normal in the natural biotope. On the other hand, certain ingredients in tap water are considered completely unproblematic, such as phosphates (these may even be added), but pose major problems for the aquarium.