Why, the less fish in the aquarium, the better?
People who are not experienced in aquariums often make the mistake of getting too many fish in the aquarium. The answer to the question whether there are too many fish in the aquarium depends on many factors, such as:
Time from setting up the aquarium - If the aquarium was installed only recently, you should not introduce a large number of fish into it. There will probably be too little bacterial flora in the aquarium (nitrifying bacteria).
Number of fish - Once there was a false idea that 1 liter of water should be allocated per centimeter of the body length of the fish. It can be used for small fish, but for large species it will not work. On the Internet you can find tables that show how much space should be allocated to fish of different species.
Fish species - fast-moving fish need more space than those that move slowly. Territorial fish will defend their area and attack the rest of the group. Some fish species (such as crucian carp) produce more nitrogen than others, so they should be kept much less than fish with a low metabolism.
Number of plants - if there are a lot of plants in the aquarium, they help in the processing of nitrogen and create valuable shelters, but, on the other hand, they take up space for fish.
Type of filtration - If the aquarium is equipped with a more efficient filter, you can (although not recommended) keep more fish in the aquarium. Internal filters have much lower efficiency than external (bucket) filters.
Amount of oxygen - in an aquarium that has a large base area, you can hold more fish than in an aquarium that is tall and has the same capacity. This is because a large water surface contributes to a better dissolution of oxygen.
General rule: the fewer fish in the aquarium, the better .
The larger the composition of the fish, the more food you need to deliver to the fish, so they excrete more feces as a source of nitrogen in the aquarium. If the filter in the aquarium has too low a capacity for water purification, the concentration of harmful substances is constantly increasing.
In addition, fish kept in too small aquariums are stressed because they have too little room for maneuver and not enough space for shelter. In a small aquarium you cannot store fish that will reach large sizes in the future, because this can lead to severe stress and abnormal growth.
What are the consequences of enumeration in an aquarium?
- more nitrates in the water, which contributes to the growth of algae and poisoning of fish. If the aquarium has been attacked by algae, first check if this is due to overfilling of the fish
- fluctuations in other water parameters, such as pH
- water color change - become less transparent, silt is deposited at the bottom
- growth retarding fish, stress, disease, reproduction difficulties
- in extreme cases - the death of fish
How to prevent abnormalities in the aquarium?
- when buying fish, it must be borne in mind that it can grow significantly and should be selected taking into account the size of an adult fish.
- You should not take fish from your friends, even if they ask you very much because we know that there is no place in our aquarium.
- checking the level of nitrates in the water and recording the results. The surest way to reduce the amount of harmful substances in the water is to reduce the density of planting.
- regular replacement of water in the tank from 10 to 25 percent per week.
- avoid overfeeding the fish - the amount and type of food should correspond to the amount of fish. Servings of food should be eaten by fish in a short time.
To summarize: an aquarium with fewer fish looks much better because it has cleaner water and the fish can show their beauty in all its glory. There is no unambiguous assessment method, if it seems to you that there are too many fish in your aquarium, then you should seek help from a more experienced aquarist or request information from verified publications.