Yellow Tail Acei Care Guide - Aquarium Setup, Diet & Breeding

The Yellow Tail Acei is a striking Lake Malawi mbuna with a deep blue to blue-violet body and a contrasting yellow or yellow-orange tail. The exact intensity of the colours varies between populations, age and individual fish, while the fins may show subtle darker edging or highlights.

Yellow Tail Acei are native to Lake Malawi in East Africa, where they are found mainly along the lake’s western shores. Wild populations inhabit areas influenced by rocky shorelines, sandy margins and submerged timber.

A group of Yellow Tail Acei should have at least a 250-litre aquarium, with a footprint of roughly 120 × 45 cm or larger. Use plenty of rockwork to create caves, crevices and visual barriers while leaving open swimming space and some sandy areas. Secure the rocks directly on the tank base before adding the substrate, and provide strong filtration, good oxygenation and alkaline, mineral-rich water.

Males reach up to about 15 cm (6 inches), while females are usually slightly smaller at around 12–13 cm (4.7–5.1 inches).

In nature, Yellow Tail Acei graze on algae, aufwuchs and the small organisms living within it. Offer a primarily herbivorous diet built around quality spirulina or algae-based flakes and pellets, supplemented with blanched vegetables such as courgette, spinach or shelled peas. Small amounts of suitable frozen foods can be used occasionally, but rich, meat-heavy diets should be avoided because they can contribute to digestive problems.

Yellow Tail Acei are relatively peaceful by mbuna standards and can be kept with other robust Lake Malawi cichlids of comparable size and temperament. Suitable companions include Rusty Cichlids, Yellow Labs, White-Tailed Acei and less-aggressive zebra or peacock cichlids, provided the aquarium is spacious and carefully stocked. Avoid delicate community fish, slow-moving species and highly aggressive mbuna, as well as very similar blue-and-yellow fish if identification and hybridisation are concerns.

Yellow Tail Acei are maternal mouthbrooders and can breed readily in a mature aquarium. Condition a group with a varied, plant-rich diet, then provide open sand or a flat rock where the pair can court. After spawning, the female collects the fertilised eggs in her mouth and carries them for around three weeks, usually eating little during this period. She releases free-swimming fry among rocks and can be given a sheltered area or moved to a separate tank if the young need protection.

Males are generally larger and may develop more intense blue colouring, fuller finnage and clearer egg spots on the anal fin. Females are typically smaller with a rounder body, although sexing young Yellow Tail Acei can be difficult and colour alone is not always reliable.