Quick Stats
| Adult Size | 8–10 cm |
| Minimum Tank | 20 gal |
| Temperature | 24–28°C |
| pH Range | 5.0–7.5 |
| Hardness (GH) | 5–15 dGH |
| Difficulty | Easy |
| Temperament | Peaceful (aggressive when breeding) |
| Diet | Omnivore — flakes, pellets, frozen bloodworm, brine shrimp |
| Schooling | Pairs (1 male + 1 female) |
Tank Setup
The Kribensis (Pelvicachromis pulcher) is the beginner nano cichlid — hardy, beautiful, and one of the few dwarf cichlids I recommend without hesitation to first-time cichlid keepers. They come from the slow-moving rivers and streams of Nigeria and Cameroon in West Africa, and they have been in the hobby since the 1950s. Easier than Apistogramma (which need soft acidic water and a steady live-food supply) and easier than German Blue Rams (which need warm, immaculate water and a six-month-established tank), the Kribensis is the right first cichlid for almost everyone. A 20 gallon tank is the realistic minimum for a pair, but a 30 gallon gives them room to breed and gives their tank mates room to escape.
Maintain water parameters within: temperature 24–28°C, pH 5.0–7.5, hardness 5–15 dGH. That is a much wider range than any South American dwarf cichlid will tolerate, and it is exactly what makes Kribensis the beginner cichlid — they will thrive in ordinary dechlorinated tap water in most parts of the country. They do not need RO water, they do not need pH adjustment, they do not need a blackwater setup. They will breed in pH 7.0 and GH 10 — try that with an Apistogramma and you'll wait years for eggs.
Set up the tank with sand or fine gravel (they dig), driftwood, hardy plants (Java fern, Anubias, Vallisneria), and at least two caves — a coconut shell with a hole knocked in it, a small terracotta flowerpot turned on its side, or a commercially-sold breeding cave. Caves are non-negotiable for Kribensis; the female uses the cave as a spawning site and the pair uses it as a refuge when they feel threatened. A tank with no cave is a tank where Kribensis sulk and refuse to breed. They are not fussy about water flow — a standard hang-on-back filter is fine.
Tank Mates
Kribensis are peaceful — until they spawn. Outside of breeding, they are mild-mannered, slow-moving cichlids that ignore most tank mates and spend their day picking at the substrate. During spawning and fry-rearing, the same pair becomes a terror: they will claim a territory roughly a third of the tank, attack any fish that enters it, and chase anything that comes near the cave. This is the single most important thing to know about the species, and the source of 90% of the "my Kribs killed everything" posts on aquarium forums.
Compatible tank mates include: fast mid-water schooling fish that can outrun the parents (Congo Tetras, Harlequin Rasboras, Pearl Danios, Lemon Tetras, Rummynose Tetras), Corydoras catfish (which are mostly ignored because they stay on the bottom), Bristlenose Plecos (too armoured to bother), and Rainbowfish. Avoid housing with other dwarf cichlids (Apistogramma, Rams, other Kribensis pairs — they will fight to the death over territory), slow-moving long-finned fish (Bettas, Guppies — fins will be shredded during breeding), and anything small enough to be eaten (Chili Rasboras, Ember Tetras, shrimp — fry will be hunted relentlessly).
Kribensis are best kept as a single male-female pair per tank. Two males in a 20 gallon will fight; two pairs in a 20 gallon will fight worse. Buy a group of six juveniles, grow them out together, and let them pair off naturally — then rehome the extras. A naturally-formed pair bonds strongly, breeds more readily, and parents fry better than a forced pair dropped together as adults. The pair will stay together for years in good conditions.
Diet & Feeding
Kribensis are omnivores. In the wild they eat insect larvae, small crustaceans, worms, and plant matter from the substrate. In the aquarium they accept flakes, pellets, frozen bloodworm, frozen brine shrimp, and the occasional live blackworm or grindal worm. They are unfussy feeders — they will eat anything offered and they will compete aggressively for food, which is part of what makes them easy to keep.
Feed small amounts twice daily. I use New Life Spectrum Cichlid Formula (small pellets) and Omega One Super Color Cichlid Pellets as the staple, with twice-weekly frozen bloodworm or brine shrimp to condition breeding. A flake-only diet works for maintenance but the colour — especially the female's purple belly and the male's red and yellow fins — fades noticeably over months without live or frozen food. Kribs in breeding condition are an entirely different fish from Kribs on flake-only; the difference is striking.
They are bottom-oriented feeders and will spend most of their day sifting sand for food. Use sinking pellets as part of the diet so they get food at their preferred level, and feed frozen bloodworm with a turkey baster or pipette directed at the substrate so it sinks to them rather than getting picked off by mid-water fish. To condition a pair for spawning, feed live or frozen foods twice daily for a week — bloodworm, brine shrimp, daphnia, anything meaty. A conditioned female will turn deep cherry-purple from chest to tail; that is the visual cue that spawning is imminent.
Common Health Issues
Kribensis are remarkably hardy — they tolerate a wider range of water parameters than almost any other cichlid in the hobby, and they shrug off the kinds of minor water quality issues that would kill an Apistogramma or a Ram within hours. The single biggest health issue I see is bloat from overfeeding, especially from a diet heavy in dry pellets and light in vegetable matter. A Kribensis fed only pellets, three times a day, will develop intestinal blockage and dropsy within months.
Like all aquarium fish, they are susceptible to ich when stressed by temperature swings or new-tank ammonia. The standard heat-and-salt treatment works well — raise the temperature to 28°C over 48 hours and dose salt at 1 teaspoon per gallon. Kribensis tolerate salt better than tetras and far better than Apistogramma, so the full label rate is safe. Internal parasites show up occasionally in newly-imported fish — look for thin, hollow-bellied fish that eat but don't gain weight. Treat with a medicated food containing praziquantel or metronidazole; do not rely on water-borne medication for internal parasites, it does not work.
Prevention is straightforward: stable temperature, weekly 25% water changes with dechlorinated water, a varied diet that includes vegetable matter (spirulina flakes, blanched spinach), and quarantine new fish for two weeks before adding them. Kribensis typically live 5–8 years in good conditions. They are one of the longest-lived dwarf cichlids in the hobby, and a pair that bonds young will stay together for most of that lifespan.
Breeding
Kribensis are among the easiest cichlids to breed in the home aquarium — they are cave spawners, they pair bond, they parent their fry, and they will spawn in ordinary tap water with no special conditioning. Sexing is straightforward and dramatic: females are smaller (6–8 cm) with a rounded belly that turns deep cherry-purple when in breeding condition; males are larger (8–10 cm) with pointed dorsal and anal fins and a more muted colour pattern. The female's purple belly is the single most reliable indicator of breeding readiness — when she turns purple, spawning is days away.
Spawning happens inside the chosen cave. The female cleans the roof of the cave, lays 50–300 eggs in a single layer, and the male follows to fertilise them. The female then guards the cave entrance while the male patrols the perimeter. Eggs hatch in 2–3 days at 26°C, and the fry become free-swimming about 5–7 days after that. Once free-swimming, both parents lead the fry around the tank in a tight school, digging in the substrate to expose food for them and attacking any fish that comes near. This is the moment when tank mates become targets — even large fast fish will be harassed relentlessly.
Feed the free-swimming fry newly-hatched baby brine shrimp, microworms, or finely crushed flake food — they are large enough at free-swimming to take BBS from day one, which makes them one of the easier cichlid fry to raise. The parents will care for them for 2–4 weeks before losing interest or spawning again (at which point they may eat the previous batch). If you want to raise the maximum number of fry, remove the parents after 2 weeks and raise the fry separately. The honest truth about Kribensis breeding: the hard part is not getting them to spawn, it is managing the tank mates during the 4 weeks the parents are defending fry. A breeding pair in a community tank will terrorise every other fish in the aquarium — this is the reason many keepers eventually move their pair to a dedicated 20 gallon breeding tank.
Frequently Asked Questions
What size tank do Kribensis need?
A 20 gallon is the realistic minimum for a single pair. A 30 gallon is better — it gives the pair room to breed and gives their tank mates room to escape when the parents start defending fry. A pair in a 10 gallon will spawn but they will kill every other fish in the tank within days of the fry becoming free-swimming.
Are Kribensis good beginner cichlids?
Yes — they are the beginner cichlid I recommend most often. They tolerate a much wider range of water parameters than Apistogramma or Rams, they breed readily in ordinary tap water, and they eat anything. The one thing to know upfront: a spawning pair becomes very aggressive. Plan your tank mates accordingly.
How can you tell male and female Kribensis apart?
Females are smaller (6–8 cm) with a rounded belly that turns deep cherry-purple when in breeding condition. Males are larger (8–10 cm) with pointed dorsal and anal fins and a more muted overall colour. The female's purple belly is the single most reliable indicator of breeding readiness — when she turns purple, spawning is days away.
Will Kribensis kill their tank mates when breeding?
During spawning and fry-rearing, the pair becomes a terror — they claim a territory roughly a third of the tank, attack any fish that enters it, and chase anything that comes near the cave. Fast mid-water schooling fish (Congo Tetras, Harlequin Rasboras) can usually outrun them; slow-moving long-finned fish (Bettas, Guppies) will be shredded. If you want to breed Kribensis without losing tank mates, move the pair to a dedicated breeding tank.