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The breeding of fish in fish tanks is not an easy task, you will need a lot of time, patience and care. In addition, the optimal conditions are necessary: appropriate water quality, food, temperature and pH.
If reproductive does not occur naturally, soft stimulation methods are used. You can try to add more trees to serve as a shelter and stimulate instinct or adjust the temperature of water. It is also necessary to check and adjust the pH level for a specific type of fish.
Water replacement more often, adding products to the diet and providing enough space for the diet is also effective. For large fish, such as Arov, sometimes a pond, Aqua-Cosmos can clarify. However, first you need to make sure you have a heterosexual fish.
As Glagus wrote earlier, in the Domacuarée hotel in Berlin, the largest aquarium in the world, of which 15,000 raw fish. 16 meters of aquarium contains 1 million liters of seawater.