IntermediateOscarAggressive

Oscar

Astronotus ocellatus

The dog of the fish world — Oscars recognize their owners, beg for food, and have distinct personalities. Large, intelligent, and personable. Available in Tiger, Red, Albino, and Lemon varieties.

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Quick Facts

Max Size14"

Lifespan10–15 years

Min Tank75 gal

DietCarnivore

SchoolingNo

OriginSouth America

Water Parameters

Temperature24–30°C

pH Range6–7.5

Natural Habitat

Slow-moving rivers, canals, and floodplains throughout the Amazon basin. Found among submerged branches and root structures.

Region

Amazon Basin

Countries

Brazil, Peru, Colombia, French Guiana

Feeding

Carnivorous — high-quality cichlid pellets, frozen krill, shrimp, earthworms. Avoid feeder fish (nutritionally poor, disease risk).

Compatible Tank Mates

Good Matches

Large PlecosBichirSilver DollarJack Dempsey (with caution)Large Catfish

Avoid

Small fish (will be eaten)Aggressive fish of same sizeAnything that fits in their mouth

Breeding

Substrate spawner. Pairs clean a flat rock and can lay 1000+ eggs. Both parents guard — can become very aggressive during breeding.

Care Tips

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75 gallons minimum for one — 125+ for a pair

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Heavy filtration required — messy eater

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Will rearrange tank decor to their liking

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Grows fast — 1 inch per month when young

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Extremely personable — will interact with you

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