Home » Animal » Purple Firefish Purple Firefish Dartfish, Marine Fish Latin name: (Nemateleotris decora) Care Level Easy Temperament Peaceful Color(s) Purple, Red, White, Yellow Diet Carnivore Preferred Conditions Easy Avg. Max Size 3¼" Minimum Tank Size 20 gallons Family Gobiidae The Clownfish is a great choice for an aquarium if you want to keep a variety of fish, as it is tolerant of a wide range of water conditions. It also makes a great beginner fish, as it is peaceful and easy to care for.