Astronotus ocellatus fish, also known as Oscar fish, is one of the types of ornamental fish that has been maintained by fish hobbyists. These fish live in freshwater and like environments with moderate lighting levels. fish hobbyists have long made Astronotus ocellatus fish as domesticated fish. This fish is usually kept in an aquarium placed at home. although it has long been kept as an ornamental fish in an aquarium, Astronotus ocellatus fish need to be considered in terms of water quality and the environment in which they live. there are some things that need to be observed in maintaining Astronotus ocellatus fish in an aquarium including: 1. The pH value of water in the aquarium, to maintain the fish Astronotus ocellatus to live well in the aquarium, the water in the aquarium must have a pH value of 7.2. 2. The level of water hardness in the water used to maintain Astronotus ocellatus fish must be 10 H. 3. The aquarium water temperature is 26 C. 4. Th...