Regan's Julie Care Guide - Aquarium Setup, Diet & Breeding

Regan's Julie is a striking Tanganyikan cichlid with a slender, elongated body and a pointed head. Its base colour ranges from pale cream to yellowish brown, overlaid with dark horizontal stripes that extend across the body and onto the fins. Individuals can vary noticeably according to their locality, with some showing stronger contrast and more pronounced yellow colouring.

This species is a specialised rock-dweller with an inquisitive, confident character. It investigates every crevice in its surroundings and spends much of its time close to solid surfaces, moving in short bursts between shelters. Although relatively small compared with many African cichlids, it is strongly territorial and can be remarkably assertive when defending a chosen spawning site.

In the wild, Regan's Julies live among the boulder fields and rocky reefs of Lake Tanganyika. Their narrow body allows them to slip into cracks while searching for small invertebrates and grazing material on the rock surfaces. The complex three-dimensional habitat also provides shelter from larger predatory fish.

Pairs often maintain long-lasting bonds and may raise several broods in the same territory. Their parental behaviour and fascinating social interactions make them one of the most rewarding Tanganyikan cichlids to observe, provided their territorial nature is respected.

Regan's Julie is endemic to Lake Tanganyika in East Africa, where it occurs around rocky shorelines in Tanzania and Zambia. It inhabits the lake's clear, alkaline waters and spends much of its time among cracks and crevices in the rocks.

A pair should be given at least 75 litres, with a larger aquarium preferred for community setups. A tank measuring around 90 cm long by 30 cm deep provides a useful minimum footprint because floor area and territorial boundaries matter more than height. Use a fine sandy substrate with a network of securely arranged limestone or other aquarium-safe rocks, forming caves, crevices and visual barriers. Keep the rockwork stable and leave some open swimming space, while maintaining the hard, alkaline conditions associated with Lake Tanganyika.

Males can reach about 13 cm (5.1 inches) in length; females are usually smaller, reaching approximately 10–11 cm (3.9–4.3 inches).

Regan's Julies are omnivorous grazers that naturally pick at algae, aufwuchs and tiny crustaceans or other invertebrates from rock surfaces. Offer a varied diet based on high-quality sinking cichlid pellets or granules, supplemented with spirulina or other algae-based foods and occasional frozen or live foods such as brine shrimp and finely chopped mysis. Feed modest portions rather than allowing uneaten food to accumulate.

Suitable tankmates include other Lake Tanganyika species with similar water requirements, such as shell-dwelling Neolamprologus, small Cyprichromis and carefully selected Tanganyikan catfish. They should not be mixed with peaceful community fish that prefer soft or acidic water. Avoid housing multiple pairs in a small aquarium, and do not combine them with similarly shaped Julidochromis or highly aggressive, substantially larger cichlids unless the aquarium is very spacious and heavily structured.

Regan's Julies form monogamous pairs and usually spawn inside a narrow cave or rock crevice. Provide several potential spawning sites, then allow an established pair to claim a territory. The female attaches a small batch of eggs to the roof or walls of the cave, while both parents guard the site. Eggs generally hatch after several days, and the fry can be fed newly hatched brine shrimp and other suitably tiny foods once free-swimming. A pair may continue defending and caring for successive broods while older juveniles remain nearby.

Females are generally larger and deeper-bodied than males, while males tend to remain slimmer and slightly smaller. These differences can be subtle, especially in immature fish, and reliable sexing is often easiest once a compatible pair has formed.