What type of fish are the Rainbow fish and Brown fish?

Rainbow fish are a group of colorful Freshwater Fish belonging to the family Melanotaeniidae, primarily found in the rivers and lakes of Australia and New Guinea. They are known for their vibrant colors and are popular in the aquarium trade. The term "brown fish" is less specific, but it may refer to various species that exhibit brown or dull coloration, often adapted for camouflage in their natural habitats. Without further specification, it could represent many different types of fish across various families.