The oscar (Astronotus ocellatus) is a aggressive fish that grows to about 14 inches and spends its time all over the tank. It can be kept on its own, in a tank of 75 gallons or more, at 74–81°F and pH 6–8.
75 galsmallest tank
14″adult size
74–81°Ftemperature
6–8pH
1+group size
Aggressivetemperament
Good tankmates
Avoid
- ✕Neon tetra: Oscar is aggressive and best kept alone.
- ✕Cardinal tetra: Oscar is aggressive and best kept alone.
- ✕Ember tetra: Oscar is aggressive and best kept alone.
- ✕Black skirt tetra: Oscar is aggressive and best kept alone.
- ✕Serpae tetra: Oscar is aggressive and best kept alone.
- ✕Glowlight tetra: Oscar is aggressive and best kept alone.
- ✕Rummy-nose tetra: Oscar is aggressive and best kept alone.
- ✕Lemon tetra: Oscar is aggressive and best kept alone.
From TankCoach's own species data: common hobby guidance for adults, rounded. Individual fish vary. Not veterinary advice.