The Masked Julie is the smallest species in the Julidochromis genus, endemic to the rocky shorelines of Lake Tanganyika. They are torpedo-shaped, crevice-dwelling cichlids with striking black and white checkerboard patterns. While generally peaceful toward other species that occupy different water columns, they are highly territorial and violently aggressive toward their own kind once a monogamous breeding pair is established.
At a Glance
Tank Requirements
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Water Parameters
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Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard
The standard wild-type form. Usually purchased in a group of 6 juveniles to allow a natural pair to form, after which the remaining unpaired fish must be removed to prevent them from being killed by the dominant pair.
Same care requirements as the base species
Also known as: Gombi, Kissi, Pemba
Masked Julie (Julidochromis) Care Guide Summary
The Masked Julie (Julidochromis), scientifically known as Julidochromis transcriptus, belongs to the Cichlids - African family group. Adults reach a maximum size of approximately 7 cm and have a fusiform body shape with a slow growth rate. Classified as semi-aggressive, this species primarily occupies the bottom and mid-level zones of the aquarium and produces a high level of biological waste.
To thrive, the Masked Julie (Julidochromis) requires a freshwater only aquarium with a minimum volume of 60 litres and a tank length of at least 60 cm. Water temperature should be maintained between 23°C and 27°C, with a pH range of 8–9 and a general hardness of 10–20 dGH. A moderate water flow is preferred. An aquarium test kit can help you monitor these values.
The Masked Julie (Julidochromis) is a rewarding species to keep, provided its core environmental needs are met. The Masked Julie (Julidochromis) is typically available in one standard form.
Masked Julie (Julidochromis) Habitat Setup
When setting up an aquarium for the Masked Julie (Julidochromis), a moderate water flow best suits their natural preferences. Because this species occupies the bottom and mid-level 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. Browse aquarium sand substrate options to find the best fit.
Masked Julie (Julidochromis) Compatibility Notes
Classified as semi-aggressive, the Masked Julie (Julidochromis) is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. 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 boisterous or fast-moving tankmates may cause this species undue stress. Selecting tankmates that favour different water layers from the bottom and mid-level zones can help reduce competition and territorial overlap.
Frequently Asked Questions About Masked Julie (Julidochromis)
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Similar Species
Shell Dweller (Multi)
Neolamprologus multifasciatus
The smallest known cichlid in the world, endemic to Lake Tanganyika. They live, breed, and seek refuge in empty snail shells. They form highly entertaining, constantly digging colonies where multiple generations live together. Sand substrate and an abundance of empty shells (such as escargot shells) are strictly required for their survival and natural behavior.
Fairy Cichlid (Brichardi)
Neolamprologus brichardi
An elegant but fiercely territorial Lake Tanganyika cichlid. They are famous for their complex social structure, forming massive, multi-generational colonies where older siblings help defend and raise new fry. Due to their extreme territoriality when breeding, they are best kept in a species-only tank, as they will aggressively eliminate non-colony tank mates.
Duboisi Cichlid (Tropheus)
Tropheus duboisi
An iconic Lake Tanganyika cichlid famous for its dramatic life-stage color change. Juveniles are jet black with brilliant white polka-dots, while adults develop a blue head and a distinctive yellow or white vertical band across a dark body. They are highly aggressive toward their own kind and must be kept in large colonies (10+) to disperse aggression. They are strict herbivores that require a specialized diet to avoid fatal digestive issues.
Kribensis
Pelvicachromis pulcher
A vibrant and highly popular dwarf cichlid native to the slow-moving rivers of West Africa. Unlike Rift Lake African cichlids, they prefer soft, slightly acidic water and densely planted tanks. They are generally peaceful in a community tank but become fiercely territorial and aggressive when breeding, often digging pits in the substrate and claiming the bottom zone. They are cave spawners and require hiding spots like driftwood or coconut shells.
Agassiz's Dwarf Cichlid
Apistogramma agassizii
A stunning South American dwarf cichlid known for its distinct spade-shaped tail and brilliant color morphs. They are bottom-dwelling micro-predators that sift sand for food. While generally peaceful in community tanks, they are highly territorial when breeding. They thrive in soft, acidic blackwater conditions.
Julii Corydoras (False Julii)
Corydoras trilineatus
Often sold in the aquarium trade as the 'Julii Cory', the False Julii (Corydoras trilineatus) is a peaceful, highly social bottom-dweller. It features a distinct reticulated (maze-like) pattern on its head and a prominent horizontal stripe down its body. As an obligate schooling fish, it must be kept in groups to thrive and feel secure. A soft sand substrate is absolutely critical to prevent the erosion of their sensitive foraging barbels.