purple firefish

actinopterygii alive anal anatomy animal appearance aquarium aquatic background beautiful beauty black bold bright colorful dart dartfish decora detail distinctive docile dorsal elegant exotic fauna fins fire firefish fish focus fulllength gobiidae gobiiformes goby hover individual isolated leaper leaping living marine monogamous multicolored nature nemateleotris one orange pet pretty purple rays red reef saltwater selective slender slim spines swimming tank tropical underwater vibrant vivid water white wildlife yellow zoology