Tiger Oscar (Astronotus ocellatus)

Tiger Oscar (Astronotus ocellatus) is one of the most personable fish in the freshwater hobby, a large South American cichlid prized for its bold black and fiery orange marbling and its dog-like personality. Oscars quickly learn to recognize their keeper, beg at the glass, and even rearrange their own tank, which is why they are often called wet pets. They are hardy and easy to feed, but they grow big and produce a lot of waste, so they reward an owner who can give them space and strong filtration.

Care Guide

Plan for a single adult Oscar in a 55 gallon tank at minimum, with 75 gallons or more strongly preferred, and add roughly 30 gallons for each additional large cichlid. They are messy eaters, so over-filter the tank and keep up with weekly water changes to control nitrate. Use smooth rock, driftwood, and sturdy decor since Oscars love to dig and will uproot loose plants. Feed a quality cichlid pellet as the staple along with occasional meaty treats, and skip live feeder fish, which carry disease and offer poor nutrition.

Specifications

Tank Mates & Compatibility

Oscars are predators that will eat any fish small enough to swallow, so pair them only with similarly sized, robust tankmates such as other large cichlids, large plecos, and big catfish, and always in a tank big enough to dilute aggression. They can be kept singly as a centerpiece fish or as a bonded pair. Avoid small community fish, slow long-finned species, and delicate invertebrates.

Recommended Supplies

• Feed a color-enhancing staple like Hikari Cichlid Gold Pellet.
• Give them sturdy hardscape to claim, such as the Hikari Texas Holey Rock cichlid cave.
• Browse all of our Freshwater & Saltwater Fish.
• Explore the full Freshwater collection for tanks, filters, and food.

Questions & Answers

How big do Oscars get and how fast?
Oscars reach 10 to 12 inches and can grow more than an inch a month when young, so they outgrow small tanks quickly. Start planning for their adult size from day one.

What size tank does one Oscar need?
55 gallons is the realistic minimum for a single adult, and 75 gallons or larger is better. Bigger tanks mean cleaner water and a happier, less territorial fish.

What should I feed my Oscar?
A high quality cichlid pellet should be the staple, supplemented with meaty foods like shrimp or earthworms. Avoid feeder goldfish, which carry parasites and can cause health problems.

Can I keep Oscars with other fish?
Yes, but only with large, sturdy tankmates such as other big cichlids or large catfish in a spacious tank. Anything small enough to fit in an Oscar mouth will eventually become a snack.