Poecilia reticulata
Poecilia reticulata is an excellent choice of fish for any hobbyist. They are specially a good choice of fish for any one starting a small tropical aquarium. The are semi-aggressive, hardy, and easy fish to keep. Have one Poecilla reticulata or a small harem just keep in mind that these can multiply rather quickly. They do well in planted and community tanks with fish of equal temperament.