Description
The Euchilus Cichlid, often referred to by hobbyists as Otopharynx lithobates “Z Rock” or simply “Lithobates Euchilus,” is a visually striking cichlid native to Lake Malawi. Valued for its intense coloration—typically a rich blue with electric highlights—it is a favourite among intermediate to advanced aquarists. Though peaceful by Malawi standards, the Euchilus is best kept in a carefully planned environment that mimics its natural rocky habitats.
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Features of a Euchilus Cichlid
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Males display brilliant blue bodies with electric blue dorsal highlights and dark facial markings
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Females are more subdued in colour, usually silvery-grey or brown
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Adult size reaches up to 15 cm
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Moderate temperament, less aggressive than many Mbuna
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Males develop elongated dorsal and anal fins as they mature
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Lifespan ranges from 8 to 10 years in captivity
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Best kept in harems (1 male to 3–4 females) to manage aggression
The Best Aquarium Size for Euchilus Cichlid
A minimum tank size of 250 litres is recommended for a small colony. Larger tanks (400 litres and above) are ideal for multiple males or mixed species setups. Ample horizontal swimming space and vertical rock structures are essential for establishing territories and reducing stress.
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Tank Mate Compatibility for Euchilus Cichlid
Avoid overly aggressive Mbuna and highly active tank mates that may stress or outcompete them.
Diet for Euchilus Cichlid
Primarily omnivorous with a preference for protein-rich foods. Offer a varied diet of:
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Aquarium Setup for Euchilus Cichlid
Aquarium Filtration
Use high-capacity biological and mechanical filtration. Canister filters or sump systems are preferred to maintain excellent water quality.
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Aquarium Plants
Live plants are optional. Hardy species like Anubias or Java Fern can be anchored to rocks, though cichlids may dig them up.
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Aquarium Lighting
Moderate lighting enhances male coloration. Avoid overly intense light to reduce stress.
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Aquarium Heating
Maintain water temperature between 24–27°C using a reliable aquarium heater with a thermostat.
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Aquarium Substrate
Use fine sand or smooth gravel to mimic their natural lakebed and allow natural digging behaviour.
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Aquarium Decorations
Incorporate rock piles and caves to form secure hiding spaces and territorial zones. Avoid sharp edges that could damage fins.
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