Tropheops gracilior

Tropheops gracilior is a mbuna species characterised by a more slender body profile and narrower snout than typical Tropheops — an adaptation that allows this species to access algae in tighter rock crevices. Males display blue-grey to steely-blue colouration with dark barring, while females are brownish-grey. The species is distributed across multiple rocky shoreline habitats in Lake Malawi.

As a member of the Tropheops group, T. gracilior is a dedicated algae grazer, spending much of its time methodically scraping biofilm from rock surfaces. It is territorial and competitive, though generally somewhat less aggressive than the largest Metriaclima species. Management in harem groups in a well-rockworked tank is standard. Females mouthbrood eggs and fry for approximately 21–28 days. An algae-based diet is critical for this species' health and colouration, and high-protein foods should be strictly limited to prevent Malawi bloat.

Water: 24–28°C, pH 7.8–8.5, hard (GH 10–25, KH 6–15); excellent filtration required for this high-waste species. Tank: 200 L minimum; build rock structures with narrow crevices to suit this species' slender build and foraging behaviour. Feeding: Strictly algae-based — spirulina flake, algae pellets, and blanched greens; no high-protein supplementation. Breeding: Maternal mouthbrooder; female holds 21–28 days; isolate to reduce harassment during brooding. Compatibility: Mix with moderate mbuna of similar temperament; avoid very aggressive Metriaclima or large Petrotilapia in the same tank.