There are five differences between freshwater fish tanks and seawater fish tanks:

1. Water quality: the water in freshwater fish tanks is fresh water, and the water in seawater fish tanks is seawater. Freshwater fish tanks need to keep the water quality stable, avoid obvious temperature changes and avoid harmful substances in the water. The seawater fish tank needs to simulate the seawater environment, keep the water quality stable, and pay attention to the changes in temperature, salinity, pH and so on.

2. Fish: Freshwater fish tanks usually keep freshwater fish, such as carp, crucian carp and perch. Seawater fish tanks usually keep marine fish, such as stickleback, butterfly fish, Sparus, etc. When selecting fish, it is necessary to consider their adaptability and survival needs to avoid putting fish in an unsuitable environment and causing death.

3. Equipment: Both freshwater fish tanks and seawater fish tanks need some basic equipment, such as filters, heaters and lamps. However, due to the different water quality of fresh water and seawater, the type and quantity of equipment selected are also different. For example, freshwater fish tanks usually need filters and oxygen pumps to keep the water quality stable, while seawater fish tanks need more complex equipment such as protein separators and wave makers to simulate the marine environment.

4. Ecosystem: The ecosystem richness of freshwater fish tanks and seawater fish tanks is also different. The ecosystem in freshwater fish tanks is relatively simple, because there are fewer species in freshwater; The ecosystem in seawater fish tanks is more complicated, because there are many kinds of organisms in seawater, so it is necessary to consider the relationship between different organisms and their impact on the environment.

5. maintenance difficulty: the maintenance difficulty of freshwater fish tanks and seawater fish tanks is also different. Freshwater fish tanks are relatively easy to maintain, because there are fewer species in fresh water and the water quality is relatively stable; However, seawater fish tanks need more maintenance work, because there are many kinds of organisms in seawater, which are sensitive to environmental changes and need to adjust and monitor the water quality frequently.

Generally speaking, there are many differences between freshwater fish tanks and seawater fish tanks, including water quality, fish, equipment, ecosystem and maintenance difficulty. When choosing which type of fish tank to keep, you need to make a choice according to your own interest, experience and ability, and fully understand the relevant knowledge and maintenance requirements to ensure the health and safety of fish.