Information about aquarium fish is extensive and may vary depending on the species of fish and the specific conditions of the aquarium. Below, I will provide an overview on the key aspects related to aquarium fish:

Water Type:

1. Freshwater: Most aquarium fish are freshwater. Proper water preparation is required to ensure proper pH, hardness, and temperature levels.
2. Saltwater (Marine Aquarium): Some aquarists opt for marine fish, which involves recreating an oceanic environment in the aquarium. This includes mixing sea salt and maintaining specific salinity levels.

Type of Fish:

1. Tropical Fishes: Many aquarium fish are tropical and come from warm regions. They include guppies, tetras, bettas, and escalars.
2. Cold-water fish: Fish such as goldfish are popular in cold-water aquariums. These fish can adapt to lower temperatures.
3. Marine Fish: In marine aquariums, you can find fish such as clownfish, surgeonfish, and sea angels.

Care:

1. Diet: Feeding varies by species. Dried, frozen, or live food can be used, depending on the needs of the fish.
2. Filtration and Water Quality: It is crucial to maintain efficient filtration and monitor water quality. Regular water changes are essential.
3. Temperature and Lighting: The water temperature must be appropriate for the species. Lighting is also essential, especially for planted aquariums.
4. Compatibility: When choosing fish, it is important to consider their compatibility in terms of size, temperament, and water requirements.

Trivia:

1. Unique Behavior: Each species has unique behaviors. Some fish are social, while others may be more territorial.
2. Planted Aquariums: Planted aquariums are popular, and some species of fish interact beneficially with plants.
3. Breeding: Some aquarium fish breed easily in captivity, while others may require specific conditions.
4. Diseases: Diseases can affect fish. Regular observation and rapid response are crucial to preventing and treating health problems.

It is essential to research specifically the species of fish you plan to keep, as needs can vary significantly. Also, keep in mind that information may change with new discoveries and advances in aquarists.