It is not without reason that aquarium keeping is one of the most beautiful and versatile hobbies. You can observe a small ecosystem up close, get to know the behavior of the different fish species and be fascinated by their exotic colors. In addition, there are many opportunities to implement your own design ideas when setting up the aquarium.
First steps
The freshwater aquarium
Among freshwater aquariums, the so-called community tank is the most common. Various species of ornamental fish, usually tropical, and different plants with similar requirements are kept in these tanks. In contrast, fish of one or more closely related species (e.g. mbuna cichlids) live in a species tank.
Checklist for the equipment
- Aquarium with cover and fluorescent tube
- Aquarium substrate, e.g. polystyrene sheet (approx. 0.5 - 1 cm thick) or soft rubber
- substrate
- Decoration: stone wood, perforated rock etc., aquarium roots and aquatic plants
- Filter: internal or external filter with filter substrate
- Regulator heater and aquarium thermometer
- Algae magnetic disk cleaner or sponge (special)
- Water conditioner and filter bacteria
- Hose for water changes
- 10-liter bucket used exclusively for aquarium maintenance
- Timer for the aquarium lighting
- Food suitable for the selected fish species
The right location
The location for the aquarium should be chosen so that the fish can be observed from a comfortable place. However, direct sunlight can promote algae growth and heat up the water too much in summer. It is therefore better not to place the aquarium too close to a window.
The load-bearing capacity of the location must be included in the planning, especially for larger tanks. Even small tanks have a considerable weight: one liter of water weighs 1 kg, plus substrate, stones and other decorations ... This can quickly add up to more than 80 kg! The safest way to store an aquarium is therefore on a special aquarium base cabinet that takes this weight into account in the static structure.
The aquarium should be placed on a polystyrene base or another special base. This compensates for any minimal unevenness in the storage surface.
Setting up the tank
The aim of setting up the aquarium is to create a species-appropriate habitat for fish and plants. The desired "biological balance" depends on an intact interplay between fish, plants, water, microorganisms and the technical equipment.
The most important steps at a glance
1. substrate and decoration
Mix about a third of the substrate washed with clear water (no turbidity should remain in the water after rinsing) with a little nutrient substrate and spread evenly over the bottom of the tank. Add the remaining substrate on top. In total, the bottom of the tank should be covered with approx. 3 - 6 cm of substrate, rising towards the back. All decorative objects such as stones, roots etc. should be scrubbed off with clear, hot water and pressed into the gravel. For fish that rummage through the substrate, make sure that the structure stands firmly on the aquarium floor and that nothing can tip over (fix with silicone if necessary)! A round-grained substrate is also preferable for such animals.
The tank is then filled to about one third with tempered tap water, which has previously been treated to suit the fish. The water values must be checked regularly, depending on the needs of your future fish.
2. introducing the aquatic plants
Before planting, you should remove the plant substrate adhering to the roots and shorten the roots of the plants by about a quarter using scissors. Fast-growing stem plants (e.g. hair moss) are ideal as background plants. They are pressed into the substrate and weighted down with a pebble. In the central area, individual rosette plants that grow in width, such as the Amazon sword plant, look particularly beautiful. To plant, simply drill a hole in the gravel with your finger and insert the plant.
To avoid blocking the view of the fish, only small plants such as the small spear leaf should be used for the foreground. The so-called perching plants also look very decorative in the foreground. They are attached to stones or roots with a nylon thread, which can also be used to tie in Java fern, for example.
3. attach the filter and control heater
Note: Always unplug technical devices from the mains before reaching into the water!
Now fill the aquarium with treated tap water to about 3 - 4 cm below the rim. Then attach the control heater to one of the rear corners of the aquarium using suction cups. In the other corner, attach the internal filter filled with filter material or - if using an external filter - the intake pipe. The corresponding diffuser is mounted horizontally at water level on the rear aquarium pane or on the side.
The thermometer is attached to the front or side aquarium pane so that the water temperature can be checked at any time. Most tropical ornamental fish species prefer temperatures around 20 - 28°C. Ask your pet shop about the exact requirements of the respective fish species.
4 Starting up the aquarium
Once all the technical equipment has been connected, the cover can now be carefully placed on the tank. The filter, heater and lighting are then connected to the power circuit. A timer ensures a regular lighting period of 10 - 12 hours.
5. running-in phase
Very important: The fish should only be introduced after a "running-in phase" of around 3 - 4 weeks. During this time, the valuable microorganisms form both in the filter media and in the substrate. They ensure the breakdown of pollutants and the biological balance in the aquarium. This process can be effectively supported by "inoculating" the filter media with filter bacteria.
6. selection of fish
After 3 - 4 weeks of the running-in phase, a suitable habitat for the fish has been created in the aquarium. The following considerations must be taken into account when selecting the inhabitants:
- The fish species must match in terms of their behavior as well as their requirements in terms of water quality and diet
- The water values can be checked using a test kit from a pet shop (more on this under "Fish-friendly water treatment and partial water changes")
- Each fish species lives in a preferred water region. The aquarium looks most lively when the upper, middle and lower water regions are inhabited
- As a guideline, a maximum of 1 cm of fish per 4 liters of water is recommended. A more densely populated tank tends to cause fluctuations in the water values, over-fertilization and increased algae growth, for example, and carries an increased risk of disease for the fish
7. introducing the fish into the aquarium
The ornamental fish should be introduced carefully to avoid "transfer shock". The transport bag should therefore be placed in the tank first to adjust the temperature and water conditions. No water should flow in or out and care must be taken to ensure that the bag is not under the lights.
After around 15 minutes, one third of the transport water is replaced with aquarium water or topped up accordingly. This process is repeated twice after a further 15 minutes. The fish are then carefully placed in the aquarium using a net. As the transport water may contain medications and microorganisms to which the small aquarium ecosystem is not adapted, it should always be poured away.