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title: "Kribensis: The Complete Care, Tank & Breeding Guide" description: "The definitive kribensis (Pelvicachromis pulcher) care guide: water parameters, tank setup, feeding, the cherry-red female, cave breeding, tank mates, and behavior." slug: kribensis commonName: Kribensis scientificName: Pelvicachromis pulcher family: Cichlidae order: Cichliformes difficulty: Beginner minTankSize: 20 temperature: "75–82°F (24–28°C)" ph: "6.0–7.8" hardness: "4–18 dGH" lifespan: "4–5 years" maxSize: "4 inches (10 cm)" origin: "Nigeria, Cameroon — West Africa" publishedAt: "2026-06-04"

Kribensis: The Complete Care, Tank & Breeding Guide

The kribensis is the West African dwarf cichlid that has converted countless aquarists into cichlid keepers — hardy, colourful, adaptable, and famously easy to breed, with the unusual distinction that the female is the showier sex, flushing a brilliant cherry-red belly when in spawning mood. Pelvicachromis pulcher (the "krib") is peaceful enough for a community tank yet delivers the full cichlid experience of pair bonding, cave spawning, and devoted dual parenting, making it one of the best first cichlids in the hobby alongside the Bolivian ram.

This guide is the complete reference: the krib's biology, exactly how to set up its tank, what to feed it, how to sex and pair it, which tank mates suit it, and how to breed this rewarding, beginner-friendly cave-spawner.

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Species Overview

The kribensis (Pelvicachromis pulcher), also called the krib, rainbow krib, or purple cichlid, is a dwarf cichlid from West Africa. It reaches about 8–10 cm (3–4 inches), with males slightly larger and more elongate. Both sexes are attractive — an elegant blend of grey, yellow, and a flush of purple-pink along the belly, with eye-spots ("ocelli") on the fins — but the female steals the show: in breeding condition she develops a vivid cherry-red to magenta belly and a rounder shape, a rare case where the female is the more colourful sex.

Kribs are hardy, adaptable to a wide range of water, peaceful for a cichlid (outside breeding), and extremely easy to breed, making them a superb first cichlid. They are cave-spawners that form strong pair bonds and make devoted parents. With good care they live 4–5 years. Their combination of colour, hardiness, manageable size, and rewarding breeding behaviour has made them a hobby staple for decades.

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Natural History and Origin

Pelvicachromis pulcher is native to southern Nigeria and coastal Cameroon, in slow, soft-to-moderately-hard, often vegetation-rich streams, deltas, and the brackish-influenced margins where rivers meet the coast. It lives among submerged wood, roots, and dense cover, foraging the bottom and seeking out crevices and cavities to spawn in. Its adaptability to a range of water chemistry — including some tolerance of slightly brackish and harder water — is part of why it's so forgiving in the aquarium.

In the wild, kribs are cave-spawning cichlids that form monogamous pairs, the pair excavating and defending a cavity in which the female lays and both parents raise the brood. This natural cave-and-pair behaviour translates directly into easy aquarium breeding. Decades of tank breeding have produced hardy, adaptable stock and a popular "albino" strain alongside the wild-type.

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Water Parameters

The kribensis is wonderfully adaptable, thriving across a broad range of pH and hardness, which is a big part of its beginner appeal. It does well in most tap water in a cycled, stable tank — confirm with the nitrogen cycle tracker and check values with the water parameters reference. One useful breeding note: water hardness/pH can influence the sex ratio of fry (more acidic, softer water tends to produce more males; harder, alkaline water more females), a quirk worth knowing if you breed them.

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Tank Setup Guide

Tank size

A pair is comfortable in a 20-gallon (75-litre) tank, with 29 gallons better for a community or to give a breeding pair space from tank mates. Footprint matters more than height.

Aquascape — caves are key

Provide one or more caves — a clay pot on its side, coconut shell, PVC, or a rock cave — as the focal point of the territory and the spawning site; a pair will adopt, clean, and defend one. Add driftwood, rocks, and planting for cover and broken sightlines, and use a sand or fine gravel substrate the krib can dig in (they like to excavate around their cave). Robust or well-rooted plants are fine; kribs may rearrange the substrate but generally don't destroy planting the way big cichlids do.

Filtration, flow, lighting

Standard reliable filtration with gentle-to-moderate flow and moderate lighting suit them well. A planted, structured tank with caves brings out their colour and confidence and sets the stage for breeding.

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Feeding Guide

Kribensis are unfussy omnivores that take a wide variety of foods.

What to feed

• Quality sinking pellets and cichlid foods — a convenient staple.
• Live and frozen daphnia, bloodworm, and baby brine shrimp — relished, excellent for conditioning a pair.
• Vegetable matter — some plant content (spirulina, blanched vegetables) rounds out the diet.
• They'll also forage the substrate for micro-fauna.

How often

Feed two to three small meals daily. Kribs feed readily and aren't easily outcompeted. A varied diet with regular live/frozen foods brings the female into rich cherry-red breeding colour. A healthy krib is well-coloured, active, and bold around its cave.

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Behavior and Temperament

Kribensis are peaceful for cichlids most of the time — a pair patrols its cave territory, forages, digs, and interacts engagingly. The picture changes at breeding time, when the pair becomes genuinely territorial, defending the area around their cave and fry and shooing other fish away. In a reasonably sized, well-structured community this is manageable; in a small tank it can mean trouble for tank mates that stray too close.

The female's transformation into a cherry-bellied, courting dynamo is one of the highlights of keeping them. Pairs form strong bonds, though occasional pair aggression can occur if a pairing is mismatched — providing caves and escape routes helps. Outside breeding, kribs are good community citizens that bring cichlid personality without the destructiveness of larger species.

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Compatibility

Kribensis are excellent community cichlids that mix with a wide range of peaceful tank mates, with breeding territoriality the main thing to plan around.

Good tank mates: congo tetra, neon tetra, harlequin rasbora, rummynose tetra, bristlenose pleco, and peaceful mid-to-upper-water schoolers that stay out of the krib's bottom territory.

Cautions:

• Other bottom-dwelling cichlids — compete for territory; give space or avoid.
• Slow or shy bottom dwellers — may be harassed by a breeding pair.
• Very small fry/shrimp — may be eaten.
• Fin-nippers — avoid.

Upper-water dither shoals are ideal, drawing the kribs out and staying clear of their cave. Use the compatibility checker to plan stocking around the pair's bottom territory.

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Breeding Guide

The kribensis is one of the easiest cichlids to breed — so easy that surprise broods are common — making it a perfect first cichlid-breeding project.

Pairing: buy a group of young fish and let a pair form, or acquire a bonded pair. Sexing is straightforward: females are smaller and rounder with a vivid cherry-red/magenta belly (especially in condition) and often rounded fins with bright ocelli; males are larger, more elongate, with pointed fins.

A bonded pair selects and cleans a cave, the female lays a clutch on the cave ceiling/wall (often 50–300 eggs), and both parents tend them — the female mostly inside guarding and fanning, the male defending the territory. Eggs hatch in a few days, and the parents shepherd the free-swimming fry around the tank in a protective cloud, an excellent display of biparental care. Fry are easy to raise on baby brine shrimp, microworms, and powdered foods. As noted, water chemistry skews the sex ratio. Breeding kribs is reliable, rewarding, and a great introduction to cichlid parenting — be prepared for regular broods from a happy pair.

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Health and Disease

Kribensis are hardy, and most problems are the standard freshwater issues, infrequent with good husbandry.

Ich can follow temperature swings or stress; treat promptly. Bacterial and fungal infections follow poor water or injury. Bloat / digestive issues can occur with poor diet. Their robustness means they rarely suffer the sensitivity problems of more delicate dwarf cichlids like the German blue ram.

Prevention: a cycled, stable tank with good water quality, a varied diet, caves and cover, peaceful tank mates, and quarantine of new arrivals. Given that, the kribensis is one of the most trouble-free cichlids in the hobby.

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Interesting Facts

• The female is the showpiece. Unusually, the breeding female is the more colourful sex, flushing a brilliant cherry-red to magenta belly.
• Water chemistry sets fry sex. The pH/hardness of the breeding water skews the male-to-female ratio of the offspring — a real, usable quirk for breeders.
• A community cave-spawner. It delivers full cichlid pair-bonding and parenting while remaining peaceful enough for many community tanks.
• Brackish-tolerant roots. From coastal West African deltas, it tolerates a touch of salt and a wide hardness range, underpinning its adaptability.
• Surprise broods. It's so easy to breed that keepers regularly discover a cloud of fry they never planned for.

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Bringing It Together

The kribensis is one of the best first cichlids you can keep: hardy, adaptable, colourful (with a uniquely showy female), peaceful enough for a community, and famously easy to breed. Give it a 20-gallon-plus tank with at least one cave to claim, driftwood and plants for cover, a sand or fine-gravel bottom to dig in, gentle flow, and peaceful upper-water tank mates — across a forgiving range of water chemistry — and it will reward you with a bold, characterful pair and, very likely, regular broods of fry shepherded around the tank. It's an ideal stepping stone to other dwarf cichlids like the Bolivian ram, cockatoo cichlid, and German blue ram. Plan the build with the AI Tank Blueprint generator and the compatibility checker.