Yellow Lab
Labidochromis caeruleus
The 'Golden Boy' of African Cichlids (10 cm / 4 inches). Unanimously considered the absolute most peaceful and beginner-friendly Mbuna. Both males and females glow in a blinding, flawless fluorescent Lemon Yellow, beautifully contrasted with jet-black fins. Easy to breed and highly adaptable.
Water Temperature
23 - 28 °C
pH Value
7.5 - 8.5
Water type
Freshwater
Tank level
Bottom and middle
Adult size
11 cm
Minimum tank volume
>= 100 L
Minimum group
>= 1
GH
10 - 25 dGH
KH
5 - 12 dKH
TDS
200 - 495 ppm
Conductivity
313 - 773 uS/cm
Species description
Geographical Origin and Habitat: Lake Malawi (Lion's Cove, Nkhata Bay). Frequents the medium-high rocky depths (10-30m / 32-98ft) but also the sand-rock transition zones, unlike almost all other Mbuna which stay only on the boulders.
Taxonomy and Morphology: Yellow Lab / Lemon Cichlid (Labidochromis caeruleus). The most iconic and widespread African cichlid in the world. Although the name "caeruleus" means "blue", the far predominant morph in the hobby is the famous "Lion's Cove Yellow".
Social Behavior: The Gentle Mbuna. Compared to the fierce reputation of its family, the Caeruleus is distinctly docile, tolerant both towards conspecifics and towards other species, exploring the tank with elegance.
Coloration and Sexual Dimorphism: A dazzling slab of pure yellow gold. The dorsal, anal and pelvic fins are crossed by a thick raven black band (often edged with white/blue). The adult male has much thicker and brighter black fins, while females, although yellow, show a faded black.
Care, breeding and tankmates
Aquarium Setup: Classic Malawi aquarium from 100 cm (40 inches) up. Rocky background with various shelters, but, given its transition biotope, abundant frontal sandy space must be left for free swimming.
Diet and Feeding: Insectivore (an oddity for an Mbuna). Its "pincer" teeth (Labido) are used to extract larvae, snails and invertebrates from crevices. Omnivorous diet: excellent a 50/50 mix of protein pellets (brine shrimp/krill) and vegetable flakes.
Water Quality: Very robust and adaptable, but needs the classic values of African lakes: ph above 7.5 (up to 8.5) and calcareous water (GH above 10). Keep nitrates very low to make the gold stand out.
Compatibility and Cohabitation: The passe-partout choice. Pairs with peaceful Aulonocara (Non-Mbuna), Pseudotropheus socolofi, or Iodotropheus. Do not pair it with Labidochromis chisumulae due to crossbreeding risk. Avoid ultra-aggressive Mbunas like Melanochromis auratus.
Aquarium Breeding: Prolific and very frequent mouthbrooders. Males in perennial parade. Females incubate for 3 weeks, releasing up to 30 yellow fry, often among the rocks saving themselves autonomously even in community tanks.
Risks and Diseases: Rampant Hybridization (Black Pecks). Commercial strains, bred promiscuously, often present horrible "smudged" black spots on the forehead and cheeks. A pure Caeruleus must be immaculate lemon yellow without black spots on the face.
Geographic Origin and Distribution
Lake Malawi (Lion's Cove, Nkhata Bay). Frequents the medium-high rocky depths (10-30m / 32-98ft) but also the sand-rock transition zones, unlike almost all other Mbuna which stay only on the boulders.
Origin
Selective breeding and cultivarsAfrica and Madagascar
Fish profile
- Temperament
- Semi-aggressive
- They have a relatively mild temperament compared to other Lake Malawi rock-dwellers. They are active, curious, and generally do not instigate fights. However, males will defend a small territory when breeding.
- Diet
- Omnivore
- Unlike most Mbuna, they are omnivores with a preference for insects in the wild. Feed them a balanced diet of high-quality cichlid pellets, spirulina, and occasional frozen brine shrimp. Do not feed them mammalian meat, as it can cause digestive issues.
- Life expectancy
- 6-10 years
- In a well-managed aquarium, the Yellow Lab (Labidochromis caeruleus) typically enjoys a lifespan of 6 to 10 years. Providing clean, hard, and alkaline water through routine maintenance is key to preventing stress and disease. A balanced diet that meets their nutritional needs keeps them active and boosts their immune system. Keeping them in stable social groups with minimal territorial stress also plays a vital role in helping them reach their full lifespan potential.
- Adult size
- 11 cm
- The catalog's scalar value is 11 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 8.1 cm for this species, recorded as standard length (SL). The taxonomic record consulted is Labidochromis caeruleus (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Harem
- A harem ratio of one male to three or four females is the best setup. While they are peaceful for Mbuna, males will still harass females to breed. Keeping multiple females spreads out this attention and reduces stress.
- Feeding frequency
- Twice daily
- Feed them small portions two times a day. They are enthusiastic eaters that will beg for food, so resist the urge to overfeed. Removing uneaten food quickly helps maintain excellent water quality.
- Bioload
- Electric Yellow Cichlids produce a moderate to high bioload. They are very active and require strong canister filtration to process their waste. Routine weekly water changes are necessary to keep nitrates at a safe level.
- Flow
- Stagnant
- They enjoy moderate water flow and well-oxygenated water. A good powerhead or strong filter return will provide the current they appreciate. Ensure the surface is agitated to maximize gas exchange.
- Reproduction
- Oviparous
- They are prolific maternal mouthbrooders and will breed readily in the home aquarium. The female holds the eggs in her mouth for about three weeks until they hatch. To raise the fry, the holding female is often moved to a separate nursery tank.
- Compatibility & tankmates
- They are considered one of the most peaceful Mbuna, but they are still cichlids. They can be mixed with other mildly aggressive Mbuna, peacocks, or haps. Avoid housing them with highly aggressive species or very delicate community fish.
- Tank level
- Middle/Bottom
- They spend most of their time in the middle and lower levels of the aquarium. They actively explore rocky caves and crevices looking for food. They are vibrant, active swimmers that make full use of the provided hardscape.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 2.6 ± 0.2 se
- Resilience
- High (less than 15 months)
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.01445, b = 2.99
- VulnerabilityLow vulnerability (10 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
