Yellow kribensis
Wallaceochromis humilis
Yellow kribensis exhibit vibrant yellow bodies with distinctive black markings on the dorsal fin and a flattened, oval shape.
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About the Yellow kribensis
This is the bigger, tougher-looking cousin in the "krib" group, with a more streamlined body and that classic West African river-cichlid attitude around a chosen cave. Kept as a bonded pair with lots of cover, they will settle in, stake out a little territory, and do that awesome cave-spawning routine where the female runs the nursery.
Also known as
Quick Facts
Size
12.5 cm
Temperament
Semi-aggressive
Difficulty
Intermediate
Min Tank Size
40 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
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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.
- Rainbowfish (Boesemani, Turquoise, etc.). They are quick, confident, and not usually interested in poking around the kribs' cave, so the kribs do their little bluff charges and the rainbows just keep swimming.
- Peaceful bottom dwellers that mind their own business like Synodontis petricola or other smaller Synodontis. They can handle a bit of cichlid sass and mostly come out when the kribs are less keyed up.
- 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
- 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 and other nosy little bottom rummagers. They wander right into the danger zone, and a guarding humilis will pin them in a corner and keep hitting them with stress.
- 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.
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