Moderate
Oscar albino (Astronotus ocellatus albino)
24–28°C · pH 6–7.5 · 450L
£15.99
Red Oscar (Astronotus ocellatus) for large mature aquariums; a bold South American cichlid needing strong filtration, space and careful tank mates.
Astronotus ocellatus
Red Oscar (Astronotus ocellatus) for large mature aquariums; a bold South American cichlid needing strong filtration, space and careful tank mates.
Cichlids are one of the most diverse fish families in the hobby. From tiny apistogrammas to massive oscars, this guide covers the basics of keeping them well.
Maintain these water conditions for optimal health and vibrant colors
Red Oscar (Astronotus ocellatus) is a bold South American cichlid for large, mature aquariums. It is popular because it becomes interactive, recognises feeding routines and develops real presence, but it also grows fast, eats heavily and needs careful tank-mate choices. Plan the aquarium before the fish, especially if you are choosing one of the smaller size options.
| Scientific name | Astronotus ocellatus |
|---|---|
| Common name | Red Oscar cichlid |
| Adult planning size | 30-35 cm is a realistic aquarium plan; larger individuals are possible |
| Minimum aquarium | 400 litres or larger for an adult; more for pairs or tank mates |
| Temperature | 24-28°C |
| pH | 6.0-8.0 |
| Care level | Moderate, but only if the aquarium is genuinely large enough |
| Temperament | Large, territorial, food-motivated cichlid |
Oscar cichlids are often sold while young and manageable, but they are not small community fish. A settled adult is strong, messy and intelligent enough to rearrange decor. The best results come from an aquarium with open swimming space, robust hardscape, strong biological filtration and a maintenance routine built around heavy feeding. Do not rely on a short-term grow-out tank unless the adult upgrade is already realistic.
| Good fit | Poor fit |
|---|---|
| Large cichlid aquariums with strong filtration | New small community tanks |
| Keepers ready for heavy feeding and water changes | Lightly filtered planted nano aquariums |
| Robust tank mates too large to swallow | Guppies, tetras, shrimp, bettas or small catfish |
Use a mature aquarium with a strong filter, stable heater and a layout that cannot trap waste. Oscars are not delicate, but they punish weak filtration. Large water changes, gravel cleaning and nitrate control matter more than decorative perfection. Smooth rocks, large roots and tough attached plants can work; fragile stems may be dug up or moved.
| Setup point | Practical target |
|---|---|
| Filtration | Oversized biological filtration for a heavy bioload |
| Decor | Robust, smooth and stable; avoid sharp objects |
| Water changes | Regular large changes to control nitrate and dissolved waste |
| Cover | Secure lid recommended, especially for active juveniles |
Feed a quality large cichlid pellet as the staple and rotate in earthworms, prawns, mussel, crickets and suitable frozen foods. Avoid feeder fish because they can introduce disease and encourage refusal of prepared foods. Oscars learn quickly and may beg whenever you approach the tank, so portion control matters.
| Food | Role | Notes |
|---|---|---|
| Large cichlid pellets | Staple | Best daily base once accepted |
| Earthworms, prawns, mussel | Rotation food | Use controlled portions |
| Crickets and insects | Enrichment | Good for natural hunting response |
| Feeder fish | Avoid | Disease and nutrition risk |
Red Oscars can work with other robust fish in large aquariums, but they are not peaceful community cichlids. Anything small enough to fit in the mouth may be eaten. Suitable companions are usually large, confident fish that can handle the same water conditions and feeding routine. Even then, individual personality matters, so watch for bullying, food theft and territorial pressure.
Do not mix this fish with small schooling fish, shrimp or delicate slow feeders. The issue is not only aggression; adult mouth size and feeding speed make small tank mates unsafe.
This product can include multiple size options depending on supplier stock, so check the selected variant before checkout. Livestock is packed carefully and sent by licensed live-animal courier where live-animal shipping applies. Follow the receiving and acclimation instructions to keep the Live Arrival Guarantee valid. New customers can use WELCOME10 when the order is eligible.
| Before ordering | Check |
|---|---|
| Adult tank plan | 400L+ adult housing is realistic |
| Filtration | Filter is sized for a messy large cichlid |
| Tank mates | No fish small enough to swallow |
| Food | Pellets and varied meaty foods ready |
Compare other Oscar forms such as Albino Oscar, Tiger Oscar, Albino Tiger Oscar and Oscar Cichlid. For other robust cichlids, see Redneck Severum and Paraguay Eartheater.
| Is a Red Oscar a beginner fish? | Not really. The care is straightforward, but only if you can provide a large mature aquarium, strong filtration and regular maintenance. |
|---|---|
| How big does a Red Oscar get? | Plan for 30-35 cm in a home aquarium, with a heavy body and strong feeding response. |
| Can it live with guppies, tetras or shrimp? | No. Small tank mates are likely to be eaten as the Oscar grows. |
| What should I feed it? | Use large cichlid pellets as the staple and rotate suitable meaty foods. Avoid feeder fish. |
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