PisciDex Species Profile
Oscar
Large intelligent predatory cichlid with heavy waste output, requiring a spacious aquarium, strong filtration, and carefully chosen tankmates.
Astronotus ocellatus
Cichlidae | South America | Amazon and Orinoco river basins
Core Requirements
Tank Size
75 gallons minimum
Adult Size
14 inches
Group Size
Solo
Bioload
9/10
Water Parameters
Temperature
74-81 F
pH
6-7.5
Plant Safe
No
Invert Safe
No
Data Confidence
high
Temperature note: Recommended and tolerated temperature ranges currently match the primary care profile.
Care Warnings
- Predatory cichlid that will eat fish small enough to fit in its mouth.
Behavior & Husbandry
Temperament
Aggressive
Aggression
6/10
Diet
Carnivore
Difficulty
Intermediate
Lifespan
12 years
Breeding
Intermediate
Schooling
No
Compatibility Tags
Large TankAggressiveTerritorialMid Water
Similar Species
Species Compatibility
Database-driven compatibility notes for planning community aquariums.