The mesonauta festivus fish is a type of freshwater fish that lives in public waters. It is native to rivers in Brazil, Peru, Paraguay, and Bolivia. Mesonauta festivus fish have a silver color with a black horizontal line from the mouth to the tip of the dorsal fin. Mesonauta festivus fish can be used as ornamental fish that are kept in aquariums at home. Generally, the aquarium used to keep this type of fish is a rectangular aquarium with a size of 120 cm x 38 cm x 30 cm. The amount of water volume used to keep mesonauta festivus fish is 145 liters. Mesonauta festivus fish (shutterstock.com) Aquariums used to keep mesonauta festivus fish can be given a sandy substrate and can be given aquatic plants with moderate aquarium water flow. To meet the need for oxygen, the aquarium can be installed with an aerator that serves to increase the dissolved oxygen content in the water. Aquarium lights can also be installed in the aquarium. Aquarium lights are selected aquari...