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.
Electric Blue Johannii At a Glance
Electric Blue Johannii Tank Requirements
Will Electric Blue Johannii fit in your tank?
Care guides tell you what Electric Blue Johannii needs, the next question is whether your tank can safely provide it. Test Electric Blue Johannii against your tank size, maintenance needs, and the fish you already keep before you buy.
Useful setup supplies
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Electric Blue Johannii Water Parameters
Water care products
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Electric Blue Johannii Temperament & Compatibility
Electric Blue Johannii Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Juvenile / Unsexed
All Johannii are born bright yellow-orange. Males will begin to darken and develop their blue/black striped coloration as they mature (around 2-3 inches). Due to their eventual high aggression, establishing a hierarchy while young is recommended.
Differs in 3 traits from base species
Also known as: Yellow Johannii, Baby Johannii
Male (Electric Blue)
Mature males boast vivid electric blue and dark navy/black horizontal stripes. They are fiercely territorial, especially towards other blue-striped fish (like Maingano). Strictly one male per tank is advised unless the aquarium is very large (450L+) and heavily stocked to disperse aggression.
Differs in 3 traits from base species
Also known as: Blue Johannii, Dominant Male
Female
Females maintain their bright yellow-orange coloration throughout their lives. They are slightly smaller and less aggressive than males. Keeping a harem of 3 to 4 females per male is essential to diffuse the male's constant breeding harassment.
Differs in 3 traits from base species
Also known as: Yellow Johannii, Orange Johannii
Electric Blue Johannii Care Guide Summary
The Electric Blue Johannii, scientifically known as Pseudotropheus johannii, belongs to the Cichlids - African family group. Adults reach a maximum size of approximately 10 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 Electric Blue Johannii requires a freshwater only aquarium with a minimum volume of 150 litres and a tank length of at least 90 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 Electric Blue Johannii is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 3 varieties: Juvenile / Unsexed, Male (Electric Blue), and Female. 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.
Electric Blue Johannii Habitat Setup
When setting up an aquarium for the Electric Blue Johannii, 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 and an established tank with natural algae growth, as they depend on it as a primary food source. 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.
Electric Blue Johannii Compatibility Notes
Classified as aggressive, the Electric Blue Johannii is a social species that requires the company of its own kind to thrive. 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.
Electric Blue Johannii Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Electric Blue Johannii.
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
Feeding products
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Frequently Asked Questions About Electric Blue Johannii
How big does Electric Blue Johannii get?
Electric Blue Johannii (Pseudotropheus johannii) typically reaches a maximum adult size of approximately 10 cm. They have a fusiform body shape and a moderate growth rate.
What tank size does Electric Blue Johannii need?
A minimum aquarium volume of 150 litres and a tank length of at least 90 cm are recommended for Electric Blue Johannii. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Electric Blue Johannii need?
Electric Blue Johannii 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 Electric Blue Johannii peaceful or aggressive?
Electric Blue Johannii is classified as aggressive with an aggression score of 8 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Electric Blue Johannii live alone?
No, Electric Blue Johannii should be kept in groups of at least 4 to reduce stress and encourage natural behaviour.
Does Electric Blue Johannii have any special tank requirements?
Yes. Electric Blue Johannii benefits from sand (sifters) and established algae (otocinclus) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Plants That Suit Electric Blue Johannii
These plants pair well with Electric Blue Johannii 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 Electric Blue Johannii
Electric Blue Hap
Sciaenochromis fryeri
The Electric Blue Hap is a striking Lake Malawi cichlid. In the wild, they are specialized piscivores that hunt the fry of other cichlids among the rocks. Due to extreme sexual dimorphism, mature males develop a brilliant metallic blue coloration, while females remain a drab silver-brown. They are best kept in a large, hard-water aquarium either as a single showpiece male in an 'all-male' Hap/Peacock display, or as a single male with a harem of multiple females.
Yellow Lab (Mbuna)
Labidochromis caeruleus
The Electric Yellow Lab is one of the most popular and widely kept African Cichlids from Lake Malawi. Classified as an Mbuna (rock-dwelling cichlid), they are famous for their vibrant yellow coloration and striking black dorsal stripes. While considered one of the most 'peaceful' Mbuna, they are still highly territorial cichlids that require hard, alkaline water, a sandy substrate for digging, and abundant rockwork to establish territories.
Cobalt Blue Zebra
Metriaclima callainos
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).
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.
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.