Yes, warm water fish can belong to freshwater fish. Freshwater fish are those that live in freshwater habitats such as rivers, lakes, and streams, while warm water fish are a category of fish that prefer or thrive in warmer water temperatures. Many warm water fish species, such as tilapia, catfish, and certain types of cichlids, are commonly found in freshwater environments. **

No, fish cannot see water. Water is their natural environment, so they do not have the ability to perceive it as a separate entity. Instead, their eyes are adapted to see other objects and creatures in the water, such as prey, predators, and potential mates. Their vision is optimized for detecting movement and differentiating between light and dark areas in their aquatic environment. **

Yes, you can use water from another fish tank for fish, but it is important to ensure that the water is clean and free from any harmful substances or diseases. It is recommended to test the water for pH, ammonia, nitrites, and nitrates before using it in a new tank. Additionally, it is important to quarantine any new fish added to the tank to prevent the spread of any potential diseases or parasites. **

The ideal water hardness for fish depends on the specific species of fish being kept. Generally, freshwater fish thrive in water with a moderate hardness level, typically between 100-250 ppm (parts per million) of calcium carbonate. However, some species, such as African cichlids, prefer harder water with a higher mineral content, while others, like discus fish, prefer softer water. It's important to research the specific requirements of the fish species you plan to keep in order to provide them with the most suitable water hardness for their health and well-being. **

Fish that belong in a technology-free aquarium are those that do not require specific water parameters to be monitored and adjusted using technology. Hardy and low-maintenance fish such as bettas, guppies, goldfish, and white cloud minnows are good choices for a technology-free setup. These fish can thrive in a simple aquarium with regular water changes and basic care without the need for advanced equipment like filters, heaters, or air pumps. **

Certain species of fish, such as koi, goldfish, and tilapia, can survive in a fish pond without flowing water. These fish are able to thrive in still or stagnant water as long as the pond is properly maintained and has adequate oxygen levels. Additionally, these fish are well-suited for pond environments because they are able to tolerate a wide range of water temperatures and conditions. Proper pond management, including regular water testing and maintenance, is essential for the health and survival of fish in a pond without flowing water. **

Fish are able to float in water due to their buoyancy. This buoyancy is achieved through a combination of factors, including their swim bladders, which are gas-filled organs that help control their depth in the water. Additionally, the shape and density of a fish's body also play a role in their ability to float. By adjusting the amount of gas in their swim bladder and making subtle movements with their fins, fish are able to maintain their position in the water column and move around effectively. **

Fish can see and feel water to some extent. They have a specialized sense called the lateral line system, which allows them to detect changes in water pressure and movement. This helps them navigate through their environment and detect prey or predators. While fish do not have eyelids like humans, they do have eyes that are adapted to see underwater, allowing them to perceive light, shapes, and colors in their watery surroundings. **