Guppis are a specie of freshwater tropical fish. Guppis are noted for having a wide variety of colors and patterns that are very unique and beautiful. Guppis are arguably the hardiest of all aquarium fishes. Guppis are also known as millionsfish, as they can reproduce in millions very quickly. They are the easiest to breed out all the aquarium fish species. Pictured above are guppis in my aquarium. Guppis like a lot plants for the guppis to hide in. I have several extremely rare mutant guppis, shown above. I also have lots of snakeskin guppis, which can be found in the gallery. Guppis are the best pets possible.