Oscar
Large predatory cichlid; small community fish may become food.
Planning your aquarium
The library starting point is 75+ US gallons. Plan for the approximate 14-inch adult size and the species' normal activity, not just its current shop size.
The minimum group count is not a compatibility recommendation; assess temperament, sex, territory, and tankmates.
Mixed-species aquariums may need substantially more space. Tank length, adult behavior, filtration, and hiding spaces all matter.
Tank setup and behavior
- Maintain stable, species-appropriate water and provide a mix of cover and swimming room.
Plan a long, strongly filtered aquarium around adult size and large waste production.
Large predatory cichlid; small community fish may become food.
Food and feeding
Food options: Large cichlid pellets, Frozen shrimp, Earthworms.
Use appropriately sized, complete staple foods and rotate suitable foods for variety. Feed modest portions and remove uneaten food.
Additional care caution
Small fish and shrimp can be swallowed. Recheck space needs as juveniles mature.
Tankmate cautions in the checker
- Avoid or investigate Cherry Shrimp: Cherry shrimp are small enough to be eaten by an oscar.
- Avoid or investigate Neon Tetra: Neon tetras are small enough to be eaten by an oscar.
- Avoid or investigate Guppy: Guppies are small enough to be eaten by an oscar.
- Avoid or investigate Chili Rasbora: Chili rasboras are prey-sized for an oscar.
- Avoid or investigate Least Killifish: Least killifish are prey-sized for an oscar.
These are selected rule-based cautions, not a complete compatibility assessment.