A striking and highly active Mbuna cichlid endemic to the rocky shores of Lake Malawi. Known for its brilliant, solid cobalt blue coloration (though white morphs exist). Like most Mbuna, they are highly territorial, rock-grazing herbivores. They require an alkaline environment, a sandy substrate for digging, and extensive rockwork to establish territories. To manage aggression, they are best kept either in heavily populated, mixed all-male Mbuna tanks or in species harems (1 male to 3+ females).
Cobalt Blue Zebra At a Glance
Cobalt Blue Zebra Tank Requirements
Will Cobalt Blue Zebra fit in your tank?
Care guides tell you what Cobalt Blue Zebra needs, the next question is whether your tank can safely provide it. Test Cobalt Blue Zebra against your tank size, maintenance needs, and the fish you already keep before you buy.
Useful setup supplies
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Cobalt Blue Zebra Water Parameters
Water care products
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Cobalt Blue Zebra Temperament & Compatibility
Cobalt Blue Zebra Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Male (Cobalt Blue)
Brilliant solid cobalt blue with pronounced egg spots. Highly territorial, especially toward other males of the same or similar-looking species. Should be kept as the single male of its species in a community, or with a harem of females.
Differs in 2 traits from base species
Also known as: Dominant Male, Blue Mbuna
Female
Usually slightly smaller than males. While often similarly colored (blue or pale blue), they exhibit less dominant behavior. Essential for diffusing male aggression in breeding groups. Best kept in ratios of 3+ females per male.
Differs in 2 traits from base species
Also known as: Female Mbuna, Girl
Pearl Zebra (White Morph)
A naturally occurring morph exhibiting a striking pearlescent white body instead of the typical cobalt blue. Their care, size, and aggressive temperament are identical to the standard blue variety.
Differs in 1 trait from base species
Also known as: Pearl Zebra, White Morph, Snow White
Cobalt Blue Zebra Care Guide Summary
The Cobalt Blue Zebra, scientifically known as Metriaclima callainos, belongs to the Cichlids - African family group. Adults reach a maximum size of approximately 11 cm and have a fusiform body shape with a moderate growth rate. Classified as aggressive, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a high level of biological waste.
To thrive, the Cobalt Blue Zebra requires a freshwater only aquarium with a minimum volume of 200 litres and a tank length of at least 120 cm. Water temperature should be maintained between 24°C and 28°C, with a pH range of 7.8–8.6 and a general hardness of 10–25 dGH. A moderate water flow is preferred.
Due to its specialist needs, the Cobalt Blue Zebra is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 3 varieties: Male (Cobalt Blue), Female, and Pearl Zebra (White Morph). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Cobalt Blue Zebra Habitat Setup
When setting up an aquarium for the Cobalt Blue Zebra, a moderate water flow best suits their natural preferences. Because this species occupies the mid-level and bottom zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour. Keepers should note that expect substrate disturbance, so lightweight décor should be secured and live planted layouts may be difficult to maintain, as this species tends to uproot or consume vegetation.
Cobalt Blue Zebra Compatibility Notes
Classified as aggressive, the Cobalt Blue Zebra is best kept in a small group for natural social behaviour. When choosing tankmates, conspecific aggression can be intense, especially in smaller tanks, territorial behaviour may cause issues if hiding spots or floor space are limited, and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the mid-level and bottom zones can help reduce competition and territorial overlap.
Cobalt Blue Zebra Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Cobalt Blue Zebra.
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
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Frequently Asked Questions About Cobalt Blue Zebra
How big does Cobalt Blue Zebra get?
Cobalt Blue Zebra (Metriaclima callainos) typically reaches a maximum adult size of approximately 11 cm. They have a fusiform body shape and a moderate growth rate.
What tank size does Cobalt Blue Zebra need?
A minimum aquarium volume of 200 litres and a tank length of at least 120 cm are recommended for Cobalt Blue Zebra. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Cobalt Blue Zebra need?
Cobalt Blue Zebra thrives in freshwater only conditions with a temperature range of 24–28°C, a pH between 7.8 and 8.6, and a general hardness of 10–25 dGH. A moderate water flow is preferred.
Is Cobalt Blue Zebra peaceful or aggressive?
Cobalt Blue Zebra is classified as aggressive with an aggression score of 8 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Cobalt Blue Zebra live alone?
No, Cobalt Blue Zebra should be kept in groups of at least 1 to reduce stress and encourage natural behaviour.
Does Cobalt Blue Zebra have any special tank requirements?
Yes. Cobalt Blue Zebra benefits from sand (sifters) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Plants That Suit Cobalt Blue Zebra
These plants pair well with Cobalt Blue Zebra based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Afzel's Anubias
Anubias afzelii
Anubias Barteri
Anubias barteri
Congo Anubias
Anubias heterophylla
Gillet's Anubias
Anubias gilletii
Java Fern
Leptochilus pteropus
Pothos
Epipremnum aureum
Fish Similar to Cobalt Blue Zebra
Electric Blue Johannii
Pseudotropheus johannii
An iconic Mbuna cichlid from Lake Malawi renowned for extreme sexual dimorphism. Males transform into a striking electric blue with dark navy horizontal stripes, while females and juveniles remain a vibrant yellow-orange. Like most Mbuna, they are highly aggressive, territorial, and require hard, alkaline water with extensive rockwork to form caves. They are avid diggers and will destroy most live plants.
Red Zebra Cichlid (Cherry Red)
Metriaclima estherae
A highly popular and vibrant Mbuna cichlid from Lake Malawi. The 'Cherry Red' or Orange morph is a favorite for African Cichlid setups. They are rock-dwelling (Mbuna), highly territorial, and require a diet rich in vegetable matter (algae/spirulina) to avoid Malawi Bloat. Best kept in a harem ratio of 1 male to 3+ females.
Afra Cichlid
Cynotilapia afra
A highly active and aggressive Mbuna (rock-dwelling cichlid) endemic to Lake Malawi. Distinctive for their unicuspid 'dog-like' teeth, they natively feed on zooplankton in the water column but remain tied to rocky territories. They require a hard, alkaline water environment with abundant rockwork for hiding and establishing territories. Best kept in a densely stocked, carefully managed species harem or Mbuna community to disperse extreme aggression.
Bumblebee Cichlid
Pseudotropheus crabro
A robust and highly aggressive Mbuna from Lake Malawi. They are famous for their rapid color changes; while females and juveniles boast striking yellow and black 'bumblebee' bars, dominant males turn almost completely pitch black. In the wild, they are opportunistic feeders that clean parasites from large catfish and steal their eggs.
Azureus Cichlid
Copadichromis azureus
A stunning open-water 'Utaka' cichlid from Lake Malawi. Males develop a spectacular metallic blue coloration, making them popular centerpieces in African Cichlid tanks. Compared to rock-dwelling Mbuna, they are relatively peaceful open-water swimmers but still require ample swimming space and hard, alkaline water.
Auratus Cichlid (Mbuna)
Melanochromis auratus
The Auratus Cichlid is a stunning but notoriously aggressive Mbuna from Lake Malawi. They exhibit extreme sexual dimorphism. They are strictly rock-dwellers that graze on algae (aufwuchs). Due to their hyper-aggressive nature, they must be kept in species-only or carefully managed, overstocked Mbuna setups with a strict harem ratio (1 male to several females) to disperse aggression.