Electric Blue Jack Dempsey - Blue Jack Dempsey Young age, its size is now 6-8 cm. The fish is active as it is known for its protein-rich diet. The fish is a centerpiece fish, meaning it is the main fish in the aquarium. Bright and beautiful color, and whoever knows about fish knows that it is not sold for less than 100, but its price is 60 with me. Indian almonds are also available.