Severums (Heros species) are one of the calmest tankmates you can keep with an Oscar. Their similar size, peaceful temperament, and overlapping water requirements make them a top recommendation for keepers who want company for their Oscar without constant aggression.
Are Severums Compatible With Oscars?
Yes — Severums are widely considered one of the best Oscar tankmates. They are peaceful for cichlids, large enough not to be eaten, and tolerate Oscar bullying without fighting back to the death.
Severum Size and Temperament
Severums grow to 8-10 inches in captivity. They are slow, methodical fish that spend most of their time grazing and exploring. Unlike most cichlids, Severums rarely initiate conflict and often back down from aggressive Oscars without injury.
Tank Size Requirements
- One Oscar + one Severum: 100-125 gallons minimum
- One Oscar + two Severums: 150 gallons
- One Oscar + Severum + other large cichlid: 180+ gallons
Best Severum Varieties
Green Severum (Heros severus): The classic. Hardy, peaceful, beautiful gold-green coloration.
Red Spotted Severum: Showier coloration, similar temperament.
Gold Severum: Yellow-orange variant. Same care as Green.
All varieties have similar Oscar compatibility.
Water Parameters Match
Severums and Oscars share nearly identical water requirements:
- Temperature: 75-82°F (both)
- pH: 6.5-7.5 (both)
- Nitrate tolerance: under 30 ppm (both)
This parameter overlap makes them an easy pairing without compromise. See our water parameter guide.
Feeding
Severums are omnivores leaning herbivorous. They eat pellets, frozen foods, and especially appreciate vegetables (zucchini, peas, spinach). Feed Oscar and Severum simultaneously to prevent the Oscar from monopolizing food.
Common Issues
Oscar bullying Severum: Most common issue. Severums rarely fight back, leading to chronic stress and faded color. Add visual barriers and ensure both fish have separate territories.
Severum hiding: If your Severum stays hidden constantly, the Oscar is likely too aggressive. Increase tank size or add more decor to break sight lines.
Severum nipping fins: Rare but possible during Severum breeding cycles. Usually self-resolves.
The Verdict
Severums are a top-tier Oscar tankmate. Calmer than Jack Dempseys, larger than convicts, and peaceful enough to coexist long-term. For 100+ gallon tanks they are an excellent choice.
Frequently Asked Questions
Can Severums live with Oscars?
Yes — Severums are one of the best Oscar tankmates. Their peaceful temperament and similar size makes them coexist well in 100+ gallon tanks.
What size tank for Oscar and Severum?
Minimum 100-125 gallons for one of each. Two Severums plus one Oscar requires 150+ gallons.
Are Severums aggressive?
No — Severums are among the most peaceful large cichlids. They rarely initiate conflict and back down from aggressive tankmates.
Will an Oscar attack a Severum?
Possible during territorial disputes or feeding. Severums usually retreat without injury, but chronic Oscar bullying can stress them.
How big do Severums get?
Severums grow to 8-10 inches in captivity, large enough to coexist with an adult Oscar without being eaten.
What do Severums eat in an Oscar tank?
Severums are omnivores leaning herbivorous. Feed quality cichlid pellets, frozen foods, and vegetables like zucchini and peas alongside Oscar feedings.
Are Severums easier than Jack Dempseys with Oscars?
Yes. Severums are far more peaceful than Jack Dempseys and require less tank space and aquascape complexity to coexist with Oscars.
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