Johannii Cichlid Care Guide - Aquarium Setup, Diet & Breeding

Johannii, also known as the bluegrey mbuna or electric blue johannii, are small, strongly built African cichlids from the rocky shores of Lake Malawi. Males typically develop a deep blue to blue-black body marked with darker vertical bars, while females are usually yellow-orange to golden, making the sexes unusually easy to distinguish.

Like other mbuna, Johannii spend much of their time moving between rocks and grazing surfaces for algae and the tiny organisms living within it. They are active, alert fish with bold personalities, and males defend territories vigorously, especially when displaying to females or competing with rival males.

Their natural habitat consists of wave-washed rock piles, crevices and caves with little open sediment. The maze of stones provides feeding surfaces, shelter and boundaries between territories, while the clear alkaline water supports a rich growth of aufwuchs.

Johannii are members of the Pseudotropheus complex and are part of the diverse mbuna community native to Lake Malawi. Their contrasting male and female colours have made them popular in African cichlid aquariums, although their territorial behaviour requires thoughtful stocking and compatible companions.

Johannii are endemic to Lake Malawi in East Africa. They are associated with rocky shoreline habitats, particularly around areas such as Cape Ngombo on the lake’s eastern side.

A minimum aquarium of 200 litres is recommended for a carefully planned group, with a footprint of at least 120 × 40 cm; a larger tank is preferable when keeping several mbuna species. Use a sandy or fine-grained substrate and build abundant piles of rounded rocks into caves, crevices and visual barriers, leaving some open swimming space. Strong filtration, good oxygenation and stable, alkaline water are important, and the rockwork should be placed securely on the aquarium base rather than directly on loose substrate.

Males reach about 10 cm (4 in), while females are usually slightly smaller at around 8–9 cm (3.1–3.5 in).

Johannii are primarily herbivorous grazers that feed on algae and aufwuchs in nature. Offer a varied diet based on high-quality spirulina or other algae-rich flakes and pellets, supplemented with blanched vegetables such as courgette, spinach or peas. Feed small portions regularly and avoid making meaty foods a major part of the diet, as rich animal-based foods can contribute to digestive problems in mbuna.

Johannii are best kept with robust Lake Malawi mbuna of a similar size and temperament, such as rusty cichlids, socolofi, saulosi or some suitable zebra-type mbuna. Maintain a single male with several females where possible, and avoid keeping multiple males or similarly coloured blue-and-yellow species in a small aquarium. They should not be housed with peaceful community fish, slow-moving species, delicate fish or fin-nippers; mixing them with peacock cichlids and calmer open-water Lake Malawi haplochromines is also usually unsuitable because their needs and behaviour differ.

Johannii are maternal mouthbrooders and can breed readily in a mature aquarium. Keep one male with several females to spread his attention. The male displays around a chosen rock or flat surface, while the female lays eggs and then collects them in her mouth. After fertilisation, she carries the brood for around three weeks, usually refusing food during this time. She can be moved to a separate, sheltered tank if the fry need to be raised safely; newly free-swimming youngsters accept crushed flake food and finely powdered fry foods.

Johannii show pronounced sexual dimorphism. Mature males are generally deep blue or blue-black with darker bars and may display blue egg spots on the anal fin, whereas females are typically yellow to orange-gold and lack the male’s intense blue colouring.