The right substrate in the aquarium
Gravel is usually used as substrate in an aquarium. If possible, special aquarium gravel should be used, as this is largely free of pollutants and the individual stones are usually rounded so that the animals cannot injure themselves. Nevertheless, this special gravel should also be washed out again before filling it into the tank. The bottom gravel is available in different grain sizes. Here it depends also on the inhabitants. For example, the gravel for a shrimp tank should be very fine, otherwise the animals could injure themselves. With fish, on the other hand, or larger bottom dwellers such as catfish and Co. then of course a somewhat larger grain size can be selected. As far as the color is concerned, this is a matter of taste. The animals themselves usually do not care about the color. However, you should consider that a contrast between animals and gravel color should be chosen so that you can see and observe the animals well.
Furthermore, the so-called depot fertilizer can also belong to the substrate. This is filled into the tank before the gravel and distributed in a thin layer. This depot fertilizer saves the regular fertilizing of the plants, e.g. with a liquid fertilizer, the plants are inserted directly into the soil and draw their nutrients from this.
A perfectly coordinated decoration
Similar to the color of the gravel, the decoration is usually a matter of taste of the aquarist. Nevertheless, the decoration is also important to a certain extent for the inhabitants of the tank. Because many animals love to hide, to explore small caves and to swim through smallest openings. Depending on the stocking and composition, it is also important that the animals have retreat possibilities. Roots, stones and other decorations with holes, openings and small caves are therefore ideal to meet the needs of the animals. After all, the animals also have such opportunities in nature. Colors, figures and shapes, however, are then again a matter of taste. Just like any back walls or posters, which are then to imitate the natural habitat.
Both with the decoration and the background aquarists can be individually active and give free rein to their creativity. Nevertheless, it is also important here to consider and pay some attention to the needs of the animals. Then an aquarium can become both a visual highlight and a living space for the animals.