Taxonomy & naming
Pseudotropheus sp. "Three Peaks" is undescribed: no holotype, no publication, no entry in Eschmeyer's Catalog of Fishes. Generic placement follows Pseudotropheus Regan, 1922, provisionally, pending any future revision. Unlike many Lake Malawi trade names, which combine a descriptive tag with a locality, this one is named purely for its collection point — Three Peaks Reef, presumably named for a distinctive rock formation — with no accompanying colour or morphological descriptor. That naming pattern is common for mbuna forms whose most obvious distinguishing feature, at least to the collectors and traders who named it, is simply where it was found rather than any single striking trait.
Morphology
This form follows the standard elongate, laterally compressed Pseudotropheus body plan, with a moderately sloped forehead and the closely packed dentition used to rasp aufwuchs from rock. Because its trade name carries no colour or pattern descriptor, no specific colouration is asserted here; the sources available do not document this population's male display colour, female pattern, or any diagnostic markings in detail. Genus-typical adult length runs roughly 3–4.5 in, males somewhat larger than females, and as in other Pseudotropheus, dominant males are expected to carry the brighter of the sexes' two colour patterns.
Habitat
Pseudotropheus sp. "Three Peaks" is recorded from Three Peaks Reef, on the Malawian shore in the southern part of the lake, near the Nankumba Peninsula and Cape Maclear area that also hosts Lake Malawi National Park — a stretch of coast with an especially dense concentration of rocky mbuna habitat and correspondingly high cichlid diversity. Like other rock-dwelling Pseudotropheus it is expected to hold territory among boulders and crevices in the shallow-to-intermediate littoral zone, roughly 7–49 ft, rather than crossing the open sand that separates one reef from the next. Water chemistry follows the Lake Malawi norm: warm, alkaline, and well-buffered, typically 75–82 °F and pH 7.7–8.6.
Feeding
As with other Pseudotropheus, this form is presumed to be a specialised aufwuchs grazer, using its rasping dentition to crop the mixed mat of filamentous algae, diatoms and associated micro-invertebrates that coats sunlit rock in the shallows. No feeding study specific to this population exists, but this diet is close to universal across rock-dwelling mbuna in the genus, and the diversity of co-occurring mbuna along this stretch of the southern lake typically partitions the algal turf by grazing angle and preferred rock texture rather than by competing head-on for an identical resource.
Mating
Breeding behaviour is presumed to follow the standard mbuna pattern: polygynous and lek-like, with no pair bond. A dominant male holds and defends a patch of rock, often centred on a crevice or small cave, and displays to attract passing females rather than forming an exclusive pairing; subordinate males remain plainer and are largely excluded from the best territory. No behavioural documentation specific to "Three Peaks" exists, and this account follows the well-established pattern for Pseudotropheus generally rather than direct observation of this population.
Breeding
Pseudotropheus sp. "Three Peaks" is a maternal mouthbrooder, as is the entire genus. After spawning, the female takes the fertilised eggs into her mouth and incubates them for roughly three to four weeks, feeding little during that period, before releasing free-swimming fry that receive no further parental care. Clutch size has not been documented for this population; genus-typical Pseudotropheus of comparable size produce clutches in the range of a few dozen eggs.
In the aquarium
Pseudotropheus sp. "Three Peaks" should be kept as a standard rock-dwelling mbuna. Dense, stable rockwork built into a tank of at least 47 in gives territorial males room to hold separate ground, with a sand or fine gravel substrate completing the setup. Water chemistry should replicate Lake Malawi: 75–82 °F, pH 7.7–8.6, consistently alkaline and well-buffered. Diet should be predominantly vegetable-based — a spirulina-forward flake or pellet as the staple — since mbuna are poorly suited to high-protein foods, which are strongly implicated in Malawi bloat. Keep a surplus of females per male, and house it with similarly robust mbuna rather than gentle community fish. Because this is an undescribed, single-locality form, preserving accurate collection-point provenance is worthwhile for anyone maintaining a breeding group.
Conservation
No IUCN Red List assessment exists for Pseudotropheus sp. "Three Peaks", and none can while it remains formally undescribed; no status, category or year should be attached to it. As a mbuna apparently restricted to a single named reef, it carries the general vulnerability shared by narrow-range rock-dwelling cichlids around Lake Malawi — dependence on a small patch of intact rocky habitat and exposure to localised over-collection for the ornamental trade — but no population-specific study documents its actual abundance or trend. The accurate statement is that it is unevaluated.