Metriaclima callainos, the Cobalt Blue Zebra, is native to the rocky shorelines of Lake Malawi in East Africa, where it is found primarily around Nkhata Bay and several other rocky mbuna habitats. Unlike the classic 'Zebra' mbuna with their barred patterning, M. callainos is notable for its clean, unbarred, uniform cobalt-blue coloration across the entire body and fins.
Males display the most intense blue coloration, with brilliant cobalt to sky-blue hues that are particularly striking under strong aquarium lighting. Females may show a similar blue base color or can be brownish-olive, depending on the geographical variant. Both sexes have the characteristic egg-spots on the anal fin used in mbuna spawning behavior.
As an mbuna (rock-dwelling) cichlid, the Cobalt Blue Zebra is an active, energetic fish that spends its time around rocky structures, defending territories and feeding on algae and associated invertebrates (aufwuchs) scraped from rock surfaces. In the aquarium, it appreciates a heavily rockscaped setup with numerous caves and visual barriers to distribute aggression.
Cobalt Blue Zebras are moderately aggressive, as is typical for mbuna, and are best kept in a harem of one male with multiple females, or in a large mixed mbuna community tank where no single individual can be singled out for prolonged harassment.
