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Metriaclima estherae Maylandia OB, also called Cherry Red Zebra OB, is an African mbuna cichlid from Lake Malawi. This form displays an OB pattern, meaning Orange Blotch, made up of irregular markings over a red-orange, pink, or cream base. It retains the lively and territorial temperament of the red zebra group while offering more color variation than the regular form. It is suited to a rocky aquarium with alkaline water, strong filtration, and careful management of territorial behavior. Its availability is generally intermediate, making it a sought-after variety without being consistently rare.

General species description

Metriaclima estherae Maylandia OB is an OB form of Metriaclima estherae, also placed in the genus Maylandia in classifications used by aquarists. It is a Lake Malawi mbuna, meaning a cichlid associated with rocky habitats and algae-covered surfaces. Its behavior is energetic and territorial, especially in breeding males. The species is best kept in a Malawi cichlid aquarium with plenty of rockwork that creates visual boundaries and shelters. Keeping several females per male helps distribute the pressure caused by persistent chasing. The OB form is valued for its distinctive blotched pattern and individual variation. It should not be mixed with other red zebras or closely related forms when avoiding hybridization is important.

Geographic origin and biotope

This captive form comes from the Metriaclima estherae Maylandia OB lineage, which originates in Lake Malawi, in the East African Rift region. Tanzania is the country reference requested, but the lake is shared by Malawi and Mozambique; the species’ natural range is associated with rocky lake habitats, particularly around Minos Reef. The biotope is bright, alkaline, mineral-rich, and generally warm and clear. Rocky shorelines provide cracks, overhangs, and surfaces covered with algae. Aquatic vegetation is limited compared with sandy shoreline habitats. In an aquarium, the habitat should be recreated with stable rock piles and no unsafe cavities. Fish sold as OB are normally produced through captive selection rather than collected from the wild.

Precise location and local name

The geographic reference most closely associated with the species is Minos Reef, a rocky area of Lake Malawi. This identifies the natural origin of the species, not a separate locality for every OB strain sold in aquariums. No specific local vernacular name for the Cherry Red Zebra OB form is used here. In the aquarium trade, the most common names are Cherry Red Zebra OB, Red Zebra OB, and Orange Blotch Red Zebra. OB describes the color pattern and is not a scientific subspecies. Females and some males may display very different markings, which explains the wide variation seen among offspring. To preserve a strain, it is best to keep properly identified breeding fish.

Appearance and physical characteristics

The body of Metriaclima estherae Maylandia OB is deep, laterally compressed, and suited to movement between rocks. The base color ranges from cherry red to orange, pink, or beige, with dark, orange, or brownish blotches arranged irregularly. This Orange Blotch pattern is the variety’s most distinctive characteristic. The fins may repeat the body colors and show darker markings; coloration also changes with sex, age, social rank, and breeding condition. Like many mbuna, it has a mouth adapted for grazing rocky surfaces. Adult size is generally about 12 cm, with some large males becoming slightly bigger. Juveniles are often less colorful and develop their pattern gradually.

General diet

In nature, Metriaclima estherae Maylandia OB grazes rocks to consume aufwuchs, the film of algae, microorganisms, and small invertebrates that grows on those surfaces. In aquariums, the diet should remain mainly vegetable-based to suit its digestive system. Quality flakes or pellets containing algae, spirulina, and plant ingredients can form the staple diet, supplemented by small regular portions. A blanched lettuce leaf or zucchini may occasionally be offered without replacing a complete food. Rich animal-protein foods and diets intended for carnivorous cichlids should be avoided. Moderate feedings two or three times daily help limit waste. A suitable diet supports coloration and reduces the risk of digestive problems caused by excessive protein.

Essential data

• River of origin: None; this is a lake-dwelling species from Lake Malawi.
• Local name used: Cherry Red Zebra OB; Red Zebra OB.
• Origin of the scientific name: Metriaclima estherae; Maylandia is another genus combination used for the species.
• Full-name etymology: estherae is a dedicated specific name; the detailed etymology of Metriaclima and Maylandia is not specified here.
• Common or vernacular names: Cherry Red Zebra OB, Red Zebra OB, Orange Blotch Red Zebra.
• Family: Cichlidae.
• Subfamily: Pseudocrenilabrinae.
• Name pronunciation: meh-tree-ah-klee-mah es-THAIR-eye - may-LAN-dee-ah es-THAIR-eye
• Discovery: Scientifically described by Jay Richard Stauffer Jr., Lois Ann Bowers, David W. Kellogg, and Robert A. McKaye in 1997.
• Maximum adult size: About 12 cm.
• Water temperature and pH: 24 to 28 °C; pH 7.6 to 8.6.
• Waterway appearance and surrounding vegetation: Rocky lake habitat with clear alkaline water and sparse aquatic vegetation.
• Typical tankmates: Maylandia callainos, Labidochromis caeruleus, Iodotropheus sprengerae, Pseudotropheus socolofi, Melanochromis auratus, Labeotropheus trewavasae.
• Temperament and behavior: Active, territorial, and quarrelsome; males defend rocky territories.
• Water depth: Rocky littoral habitat, generally shallow to moderately deep.
• Sexual dimorphism: Variable in the OB form; adult males are often larger and more territorial, while females may show a different pattern.
• Bottom structure and flow: Rocky bottom with cracks and overhangs; lake water without strong current.

In your aquarium

To succeed with Metriaclima estherae Maylandia OB, provide a spacious, strongly filtered aquarium structured with securely placed rocks. Maintain warm, alkaline water, perform regular water changes, and offer a mainly vegetable-based diet. A ratio of one male to several females helps reduce targeted chasing. Watch for stress, injuries, and excessive control of a single shelter. Avoid overly peaceful tankmates or fish with incompatible requirements. Stable parameters, adequate floor space, and numerous visual barriers are the keys to long-term community success.