Severum Cichlid: A South American Cichlid for a Community Tank?
Severums are often labeled as peaceful community cichlids — a description that works only when tank size and tankmate selection are carefully matched.
Severum community compatibility check
Topic
| Topic | Severums | Angelfish (often compared) | Practical tip |
|---|---|---|---|
| Adult size | 8-10 inches, fairly thick-bodied | 6-8 inches, tall body | Both need generous tank size long-term |
| Temperament | Mild for cichlids but still territorial | Generally peaceful, can pair up | Neither is a true community fish without space |
| Tank size min | 55+ gallons for a single or pair | 40+ gallons | Bigger is safer for both |
| Tankmate risk | Will eat very small fish | Similar — small fish risk predation | Avoid nano species with either |
Severum keeper rules
| Plan for adult size, not store juvenile size | |
| Provide caves, driftwood, and visual barriers for territory | |
| Keep them with similarly sized peaceful-to-moderate tankmates | |
| Feed varied high-quality diet with vegetable matter | |
| Expect some digging or rearrangement of the scape | |
| Treat a severum like a nano community fish | |
| Assume cichlid means aggressive — severums are often milder | |
| Crowd the tank because they look peaceful as juveniles |
Severums are one of the more community-compatible cichlids, but that statement works only with adequate tank size, careful tankmate selection, and territory structure.
What looks like a friendly juvenile will grow into a 8-10 inch cichlid with opinions about territory. Plan the adult aquarium, not the juvenile grow-out.
Severum cichlids (Heros severus and Heros efasciatus) are large, relatively peaceful South American cichlids that reach 8-12 inches and are often successfully kept in community setups with other large fish. They are herbivorous tendencies, beautiful, and personality-rich -- but they will eat plants and small fish.
| Parameter | Specification | Notes |
|---|---|---|
| Min tank | 75 gal (pair: 125+ gal) | Active mid-water swimmer; needs continuous cruising room |
| Temperature | 75–84°F | Broader tolerance than discus — accessible to more aquarists |
| pH / Hardness | 6.0–7.5 / 5–15 dGH | Forgiving range; accepts most municipal tap water |
| Soft plants | Consumed — use Java fern/Anubias | Supplement zucchini/spinach to reduce browsing pressure on plants |
Species Identification
The 'common severum' in trade is most often Heros efasciatus, the banded severum. Heros severus (true severum) is less common. The gold severum morph (a captive-bred color variant of H. efasciatus) is widely available. Both species are disk-shaped, laterally compressed cichlids similar in body plan to discus but hardier and less demanding. Adults develop a pronounced forehead hump (especially males). Coloration: wild type green-brown with dark vertical bands; gold morph bright yellow with orange spots on the head and shoulders.
Tank Requirements
Minimum 75 gallons for a single adult; 125+ gallons for a pair. They need swimming room -- these are active mid-water fish that cruise the tank constantly. Filtration must be robust; severums have a significant bioload. Temperature: 75-84F. pH: 6.0-7.5. Hardness: 5-15 dGH. They accept a wide range of water chemistry more readily than discus, making them accessible to a broader range of aquarists.
The Plant Problem
Severums are omnivores with strong herbivorous tendencies -- they eat soft-leaved aquatic plants. Anacharis, hornwort, and lettuce leaves are consumed eagerly. If planted tanks are desired, use tough plants (Java fern, Anubias, crypts) that are less palatable, and accept some browsing. Many severum keepers use artificial plants or minimal decoration. Provide supplemental vegetable matter (blanched spinach, zucchini, peas) to reduce pressure on plants.
Temperament and Tankmates
Severums are cichlids -- they have cichlid personality, including territory defense during breeding and occasional aggression. But relative to other large cichlids (flowerhorns, large Neotropical cichlids), they are often compatible with: other large South American cichlids (Geophagus, large tetras like red hooks), peaceful large catfish (Sailfin Pleco, Royal Pleco), Silver Dollars (which can withstand the severum's pace). Avoid: aggressive cichlids that will harass them, small fish they will eat, fin-nippers that will damage their long fins.
Breeding
Egg-laying substrate spawners. Pairs bond strongly and both parents guard eggs and fry aggressively -- move other tankmates out during spawning. Eggs are laid on flat rocks or broad-leaved plants. Fry are free-swimming after 5-7 days and can take freshly hatched brine shrimp. Breeding pair aggression is intense -- if a pair harasses tankmates dangerously, they need to be moved to a species tank.
Sources: Fishbase species accounts Heros efasciatus and Heros severus; Stawikowski R, Werner U, Die Buntbarsche der Neuen Welt; Kullander SO, Cichlidae systematics; Aquarium Fish Magazine species care archives.