There are many advantages of having freshwater fish as they can adapt to most home fish aquariums. Compared to saltwater fish they are more relaxed and less formal, therefore freshwater fish is the perfect choice for beginners. They get along with both tropical and cold water fishes. Freshwater fishes include the common goldfish, the banjo catfish, the reed fish and many more.
Goldfish
The goldfish is usually found in slow, flowing dwellings. They are capable of adapting to different water temperatures. Goldfish are usually found open pools. They are colorful fish who originate from eastern Asian waters. Common in many homes and are usually kept in tanks, ponds or kept in aquariums.
Cold water fish like the goldfish can adjust to cool waters. This means it may not be necessary to purchase a heater given that you are only housing fishes of this nature. Goldfish thrive in tropical environments. However, you still have to strike the correct water balance in accordance temperature. They need oxygen; this is why most goldfish swim to the surface to get air into their systems.
A happy Goldfish 
Reed fish
Reed fish also known as rope fish thrive in well planted tanks, and require the temperature of the water to be set between 73° to 79°F. As a result of this they sometimes find it hard to settle in Goldfish water. Before purchasing a reed fish make sure you read the manuals about them and position questions at your local pet shop in order to find out more about the environment they thrive.
Good Luck
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