Yellow kribensis
Wallaceochromis humilis
Yellow kribensis exhibit vibrant yellow bodies with distinctive black markings on the dorsal fin and a flattened, oval shape.
This page includes AI-generated images. Why am I seeing AI images?
About the Yellow kribensis
A large ‘krib’ from West Africa (Guinea to Liberia), Wallaceochromis humilis is the biggest member of its group, forming pairs and defending caves for spawning. In soft to medium, slightly acidic–neutral water it becomes strongly territorial around a chosen cave and exhibits classic biparental cave-spawning behaviour.
Also known as
Quick Facts
Size
12.5 cm
Temperament
Semi-aggressive
Difficulty
Advanced
Min Tank Size
55 gallons
Lifespan
5-8 years
Origin
West Africa
Diet
Omnivore - quality pellets/flakes plus frozen/live foods (worms, insect larvae, small crustaceans)
Water Parameters
24-26°C
6-8
5-12 dGH
Need a heater for this species?
This species needs 24-26°C in a 55 gallon tank. Use our heater calculator to find the right wattage.
Calculate heater sizeCare Notes
- Give them a footprint tank with lots of cover - rocks, driftwood, and at least a couple tight caves (coconut, clay pots, rock piles). They feel way bolder when they can vanish fast.
- They do best in soft to medium water and slightly acidic to neutral pH (roughly 6.0-7.2). Keep nitrates low with regular water changes because they get cranky and wash out in dirty water.
- Sand or smooth fine gravel works great since they like to sift and poke around. Add leaf litter or botanicals if you want them to color up and act more natural.
- Feed small portions 1-2 times a day: good pellets or granules as the base, then mix in frozen foods like brine shrimp, daphnia, and bloodworms. Go easy on fatty stuff and dont overdo bloodworms or you will see bloaty bellies.
- Tankmates: calm midwater fish (small barbs, danios, rainbows, Congo tetras) usually work, plus tougher bottom fish like Synodontis. Skip other cave-hogging cichlids and avoid slow long-finned fish because humilis can turn into fin-nippers when theyre in a mood.
- If you keep a pair, expect a serious attitude shift once they pick a cave - they will defend a big chunk of the tank. Break line-of-sight with rocks and plants so everyone can get away.
- Breeding is pretty straightforward: a tight cave and warmer water (around 78-80F) gets them going, and the female gets super yellow. Parents guard hard, so either give them a species tank or be ready to move other fish if you want fry to survive.
- Watch for bloat/constipation and hole-in-the-head style issues if water quality slips. If one starts hiding and pinching food, check ammonia/nitrite first, then cut feeding for a day and switch to lighter foods (daphnia) for a bit.
Compatibility
Good Tankmates
- Fast midwater schooling fish like Congo tetras or larger barbs (think rosy or tiger - but only if the group is big enough to spread the attitude). Kribs get feisty around a cave, so you want tank mates that can just cruise past and not panic.
- Peaceful bottom dwellers like upside-down catfish (Synodontis nigriventris) or other small West African Synodontis. Avoid Tanganyikan species such as S. petricola, which prefer hard, alkaline water.
- Bristlenose pleco (Ancistrus). Tough, armored, and generally ignored - just give the pleco its own hiding spots so it is not trying to squeeze into the kribs' favorite cave.
- Dither fish like larger danios (giant danios) in a bigger tank. They are constantly on the move, which weirdly helps keep kribs less paranoid and less likely to pick on one specific fish.
- Other robust West African community types that stay up top or midwater (like African butterflyfish if your tank is covered tight). The key is they are not cave squatters and they do not harass the kribs.
Avoid
- Many rainbowfish commonly named (e.g., Melanotaenia boesemani) prefer harder, more alkaline water (approx. pH 7.0–8.0, GH >10) and are a poor match for W. humilis which does best in softer, slightly acidic to neutral water.
- Other cave-spawning or bottom-territorial fish (other kribs, Julidochromis, most Apistos, many small cichlids). Yellow kribs get very 'this is my cave, go away' and it turns into constant border wars, especially if they pair up.
- Corydoras during breeding, as guarding pairs are highly territorial over caves; in non-breeding setups with ample space and broken lines of sight they may coexist, but use caution.
- Slow fish with fancy fins like bettas, guppies, and long-finned angels. Even if the krib is not a fin-nipper by nature, the constant chasing and posturing around the lower half of the tank beats those fish up.
- Anything nippy or aggressive like many Mbuna, aggressive barbs in small groups, or pushy Central American cichlids. The humilis will not back down, and you end up with a tank that is just one long fight.
Where they come from
Yellow kribensis (Wallaceochromis humilis) come from West Africa, mostly slow streams and swampy edges where leaf litter, roots, and scattered rocks break up the space. They are basically built for picking through the bottom and claiming little hideouts. If you set the tank up with that vibe, they settle in way faster.
Setting up their tank
Think of them as small cichlids with big opinions. Give them structure and multiple hiding spots and you will see their best behavior. A 20 long can work for a pair, but 30-40 gallons makes everything easier, especially if you want tankmates.
- Tank size: 20 long minimum for a pair, 30+ if you want a calmer community setup
- Substrate: sand is my pick (they sift and dig), fine gravel works if its not sharp
- Hardscape: 2-3 caves minimum (more if you add other fish), plus wood/rocks to break lines of sight
- Plants: tough stuff like Anubias, Java fern, Vallisneria - they may redecorate around the base
- Filtration: steady and not too blast-y; they like gentle flow with good biological filtration
Water-wise, they are pretty forgiving compared to some other West Africans. Neutral-ish water is usually fine. I have kept them in the mid 70s F with no drama. The bigger deal is keeping the tank stable and clean because they live close to the bottom where gunk collects.
Caves matter more than you think. If you only give one good cave, they will fight over it or stake out the whole tank. Spread caves apart and block the view between them with plants or wood.
What to feed them
They are enthusiastic eaters and will take most foods, but you get better color and fewer random issues if you feed a mix. I treat them like little omnivores that lean meaty.
- Staples: quality small cichlid pellets or granules (sinking or slow-sinking)
- Frozen: bloodworms, brine shrimp, mysis, daphnia (rotate, dont just do one)
- Live (optional): blackworms or baby brine for conditioning and for fry
- Veg/fiber: spirulina flakes, blanched zucchini or spinach once in a while
Go easy on fatty foods like tubifex and dont hammer them with bloodworms every day. These guys can get bloaty if you feed rich stuff nonstop.
I feed adults once or twice a day, small amounts. If you see food sitting on the bottom, you are feeding too heavy or your other fish are missing it. With humilis, leftover food turns into territory fights because they patrol that bottom area.
How they behave and who they get along with
They are not a nonstop brawler, but they are definitely a cichlid. Most of the time they are busy hovering near their cave, sifting sand, and doing little display shimmies at each other. The mood changes fast if they pair up or decide a corner belongs to them.
- Best tankmates: small-to-medium peaceful schooling fish that stay mid/upper water (tetras that like similar water, rasboras, barbs that are not fin-nippy)
- Also works: calm bottom-adjacent fish that can handle a little attitude (some Synodontis catfish, small plecos with enough space)
- Avoid: other cave-spawning cichlids in small tanks, slow long-finned fish, and anything that hangs on the bottom in their territory
In a community tank, a dither school helps. If the upper levels are calm and active, the kribs are less likely to be jumpy and less likely to fixate on one tankmate.
If you keep more than one, space and sight breaks are your friend. Two males in a tight setup usually turns into one stressed fish hiding all the time. A bonded pair is the easiest way to keep them, but even pairs will defend a zone hard during spawning.
Breeding tips
They are classic cave spawners. If they are happy, breeding is not rare, and it is honestly one of the coolest things to watch because the parents actually do a decent job guarding and herding fry.
- Give them a real spawning cave: coconut shell, small flowerpot on its side, rock cave, or a tight piece of wood with an opening
- Condition with frozen/live foods for a couple weeks and keep water changes regular
- Keep tank lighting a bit subdued and add leaf litter if you like that natural look (it also makes fry feel safer)
- If you want maximum fry survival, breed them in a species tank or be ready to move fry to a grow-out
Make the cave opening just big enough for the adults. If its too wide, other fish will try to sneak in, and thats when you get chaos in the tank.
For first foods, baby brine shrimp is the gold standard, but powdered fry foods can work if you stay on top of water quality. Expect the parents to get extra spicy while they are guarding. If you have a community tank and they spawn, you may want to rearrange some decor to break territories or temporarily move the most bullied fish.
Common problems to watch for
Most issues I have seen with humilis come from three things: not enough cover, sketchy water quality at the bottom, or diet that is too rich. Fix those and they are pretty sturdy.
- Hiding all the time: usually stress from aggressive tankmates, too bright/open a tank, or not enough caves
- Torn fins and missing scales: territory disputes, especially if there is only one good cave or too many bottom fish
- Bloat and stringy poop: overfeeding, too many fatty foods, or internal parasites (watch for weight loss despite eating)
- Ich outbreaks after new fish: they can handle meds fine, but the real fix is quarantine and stable temps
- Sudden aggression spikes: often tied to spawning or a fish reaching maturity and claiming a zone
If one fish is getting pinned in a corner, dont wait it out. Add sight breaks, add another cave, or separate them. Cichlid stress goes downhill fast once a fish stops coming out to eat.
Similar Species
Other freshwater semi-aggressive species you might be interested in.
Jupiaba kurua
Small South American characin endemic to the upper rio Curuá (rio Xingu basin, Brazil). Reaches about 8.7 cm SL and inhabits clearwater rivers. Distinguished by dark dots on the bases of many lateral scales and a distinct dark caudal‑peduncle spot. Reported diet indicates omnivory, including aquatic insects, small fishes, and fragments of Podostemaceae and filamentous algae.
Altipedunculata stone loach
Schistura altipedunculata
Schistura altipedunculata is one of those little stream loaches that wants clean, well-oxygenated water and a bunch of rock nooks to claim as home. It is a bottom-hugger that will spend its day scooting from crevice to crevice, and it tends to get a bit spicy with its own kind if you do not give it enough hiding spots.
American flagfish
Jordanella floridae
Jordanella floridae is that little Florida native with the red-and-cream striping that really does look like a tiny flag once a male colors up. They graze algae like champs (especially stringy/hair algae), but they have a bit of attitude - give them plants and space so the bossy behavior stays manageable. Bonus: the male guards the eggs and will actively fan them, which is pretty fun to watch.
Amur sculpin
Alpinocottus szanaga
This is a little coldwater sculpin from the Amur drainage - a bottom-hugging, rock-and-gravel fish that spends its day wedged under stones and darting out to grab food. Super cool behavior and attitude, but it is absolutely not a warm tropical community fish - it wants chilly, fast, oxygen-rich water and will bicker with other bottom fish.
Anitápolis livebearer
Jenynsia weitzmani
Jenynsia weitzmani is a freshwater anablepid livebearer endemic to southern Brazil (currently known only from the type locality near Anitápolis, Santa Catarina). Like other Jenynsia (onesided livebearers), reproduction involves lateralized mating morphology/behavior; aquarium care guidance is not well-documented for this species specifically.
Aracu-comum
Schizodon vittatus
Schizodon vittatus is a large South American anostomid (family Anostomidae). Reported maximum size is about 35 cm standard length; it is harvested/consumed in parts of Brazil and is not commonly covered by mainstream aquarium husbandry references.
More to Explore
Discover more freshwater species.
Amphilius dimonikensis
A small loach catfish endemic to the Mpoulou River in the Mayombe (Dimonika Biosphere Reserve), Republic of the Congo. Amphilius dimonikensis has a subtle banded pattern and inhabits fast, clear streams over rock and sand. In aquaria, prioritize strong, well-oxygenated flow with rounded stones and sand to mimic hillstream conditions.
Aboina barb
Enteromius aboinensis
Enteromius aboinensis (the Aboina barb) is a small West African barb with a clean black midline stripe and a little spot right at the base of the tail. It does best when you treat it like a proper schooling fish - keep a decent group and give it plants around the edges with open swimming room in the middle.
Ajuricaba tetra
Jupiaba ajuricaba
Jupiaba ajuricaba is a South American freshwater characin from the Amazon basin in Brazil (rio Negro, rio Solimões, and rio Tapajós basins). It reaches about 9.5 cm SL and is diagnosed by a narrow dark midlateral stripe, an elongated humeral spot, and an ocellated spot on the upper caudal-fin lobe. Wild specimens have been collected from blackwater forest streams and also oxbow-lake habitats.
Allen's river garfish
Zenarchopterus alleni
A poorly known freshwater halfbeak endemic to West Papua (Mamberamo River), described from a single specimen (~13 cm SL). Beyond basic habitat/occurrence, little is published about its ecology or aquarium suitability; assume it is a surface-oriented, jump-prone halfbeak only by analogy with related taxa.
Amapa tetra
Hyphessobrycon amapaensis
This is a tiny, super sleek little tetra with a clean red stripe down the side that really pops once its settled in. It does best in a planted, slightly tinted "creek-style" setup and looks way cooler when you keep a proper group so they school and flash that line together. If you can give it soft, slightly acidic water and a calm community, its an easy fish to fall for.
Amatlan chub
Yuriria amatlana
Yuriria amatlana (the Amatlan chub) is a little Mexican native minnow from the Ameca River basin. Its wild range is pretty limited and it is listed as Endangered, so its care info in the aquarium hobby is basically nonexistent and its availability is usually low. In the original species description, preserved fish show a dark lateral stripe with a darker patch on the caudal peduncle, and they can have tiny barbels at the mouth corners.
Looking for other species?