Nubilus Hap Care Guide - Aquarium Setup, Diet & Breeding

The Nubilus Hap is a relatively compact Lake Victoria cichlid with a deep-bodied profile, a pointed head and the confident, alert manner typical of haplochromine cichlids. Adult males develop stronger colour than females, commonly showing blue or blue-green tones on the head and body with darker markings and warm red, orange or yellow accents in the fins. Females are generally more subdued and silvery or grey-brown, often retaining vertical bars or blotches.

This species is active and inquisitive, spending much of its time inspecting rockwork and the open water around its territory. Males become territorial, particularly when displaying or preparing a spawning site, but the species is not usually regarded as one of the most aggressive Lake Victoria cichlids. Its behaviour is shaped by social rank, available shelter and the presence of mature males.

In the wild, Nubilus Haps are associated with the complex shoreline environments of the Lake Victoria basin. Rocky edges, sandy patches, submerged vegetation and shallow sheltered areas provide feeding grounds, refuges and spawning locations. Their natural habitat changes considerably between sites, which helps explain their adaptable appearance and behaviour.

Haplochromis nubilus belongs to the diverse group of mouthbrooding cichlids native to the African Great Lakes and their surrounding basins. Like other maternal mouthbrooders, it provides remarkable parental care: the female protects the eggs and developing young inside her mouth until the fry are ready to emerge.

Haplochromis nubilus originates in the Lake Victoria basin of East Africa, with populations associated chiefly with Lake Victoria and nearby waters in Uganda, Kenya and Tanzania. It inhabits shallow coastal areas, rocky margins and other structurally varied habitats around the lake system.

A group should be housed in an aquarium of at least 200 litres, with a footprint around 120 cm long by 40 cm wide or larger preferred. Build open-ended rockwork into caves, ledges and visual barriers so subordinate fish can retreat and males can establish separate territories. Use a fine sand or smooth-gravel substrate, leave swimming space through the centre and secure heavy décor firmly. Hardy plants may be used where desired, although rocky Lake Victoria-style layouts are often the most practical. Keep the water warm at approximately 24–28°C and alkaline, with a pH around 7.5–8.5.

Males reach about 12 cm (4.7 inches) in length, while females are usually smaller at around 8–10 cm (3.1–3.9 inches).

In nature, Nubilus Haps feed chiefly on small aquatic invertebrates and other animal matter collected from rocks, plants and sediment. Offer a varied carnivorous-leaning diet of quality cichlid pellets or granules supplemented with frozen or live foods such as mysis shrimp, brine shrimp, daphnia and finely chopped insect larvae. Feed modest portions once or twice daily and avoid making fatty mammalian foods or an excessively rich diet a regular part of the menu.

Nubilus Haps can be kept with similarly sized, robust Lake Victoria haplochromines and other compatible African cichlids, provided the aquarium offers plenty of territory and visual barriers. Suitable companions may include peaceful to moderately assertive Victorian haps of comparable size and temperament. Avoid very timid fish, delicate community species and highly aggressive mbuna, as well as closely related or similarly patterned males that may provoke persistent conflict or hybridisation. They should not be kept with small tetras, livebearers or ornamental shrimp, which may be harassed or eaten.

Nubilus Haps are maternal mouthbrooders. Provide a mature aquarium with rocky territories and keep one male with several females to spread his attention. After spawning, the female holds the fertilised eggs and fry in her mouth for around two to three weeks. She releases free-swimming young among cover, although she may take them back into her mouth if threatened. Newly released fry can be raised on finely crushed flakes, small granules and baby brine shrimp.

Males are larger and much more vividly coloured, often developing blue-green body tones and red, orange or yellow markings in the fins. Females remain smaller and are generally silver, grey-brown or olive with darker bars or blotches; mature males may also show more elongated dorsal and anal fins.