Hemiancistrus sp. L-128

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Hemiancistrus sp. L-128, also known as Blue Phantom, is a Colombian loricariid commonly traded under the L-128 code. This formally undescribed fish therefore retains a provisional name, yet it remains popular for its blue-gray coloration and sturdy appearance. Like many tropical river loricariids, it does best in warm, well-oxygenated water with plenty of shelter. The available specimens are wild-collected, so careful acclimation is especially important. Its availability is generally common through specialist aquarium channels.

General species description

Hemiancistrus sp. L-128 is an armored catfish from the family Loricariidae, associated with broad-snouted loricariids that have a body strongly protected by bony plates. The L-128 code belongs to the aquarium “L-number” system, which is used to identify imported loricariids before formal scientific description. Its body is adapted to life on hard surfaces, while its ventral sucker mouth helps it attach to rocks and graze on available foods. In aquaria, it is mostly active at dusk and during the night. Provide efficient filtration, strong oxygenation, and several retreats. Despite its respectable size, it is usually peaceful with compatible bottom-dwelling fish. The Blue Phantom’s common availability should not replace careful selection of well-acclimated, healthy specimens.

Geographic origin and habitat

The Blue Phantom is associated with the Orinoco basin in Colombia, in tropical waterways where flowing water passes over mineral substrates. Its habitat generally includes rocky areas, boulders, gravel, and submerged wood, with more vegetation in calmer sections and along the margins. Current helps maintain high oxygen levels, which are essential for this loricariid. In an aquarium, recreate this dynamic with steady circulation without producing a current so strong that feeding becomes difficult. A temperature of 26 to 30 °C, soft to moderately mineralized water, and slightly acidic to neutral pH are generally suitable. Regular water changes are important because organic waste and poor oxygenation are poorly tolerated by fish associated with clean, flowing rivers.

Precise location and local name

In the aquarium trade, the most widely used name is Blue Phantom Pleco, or simply Blue Phantom. The L-128 code is a practical way to distinguish this commercial form from other bluish loricariids, including fish sold under nearby L-numbers. The commonly stated origin is Colombia, within the Orinoco basin. No broadly standardized Colombian vernacular name is associated with this fish in common aquarium use. Keeping the L-128 code together with the provisional name Hemiancistrus sp. is preferable, rather than presenting it as a formally described species. For Canadian aquarists, “Blue Phantom L-128” is the clearest wording for purchases or exchanges. Since these are wild-collected fish, lot identification and the supplier’s provenance information remain particularly useful.

Appearance and physical characteristics

The Blue Phantom has a stocky, ventrally flattened body covered with bony plates and ending in a well-developed caudal fin. Its base color ranges from bluish gray to slate blue, often becoming more intense when the fish feels secure. The fins may show darker markings or subtle edging, while the head appears broad and robust. Its sucker mouth is adapted for clinging to rocks and collecting food from the bottom. Adults may reach approximately 15 to 20 cm in aquaria, depending on rearing conditions. Mature males may develop more pronounced odontodes on the cheeks and caudal peduncle, helping with sex identification. This armored blue-gray profile explains much of the L-128’s appeal among loricariid keepers.

General diet

Hemiancistrus sp. L-128 is an omnivore with a detritivorous tendency, but its diet should not depend only on algae growing in the aquarium. Offer quality sinking wafers containing plant matter, along with more protein-rich foods such as catfish pellets, granules, and occasional small portions of frozen foods. Blanched vegetables, including zucchini, cucumber, or spinach, can add variety. Feed after the lights have partly gone out, when the fish becomes more active. A submerged root or piece of wood is useful in the layout, even though this fish is not an exclusive wood-eater. Watch competition from other bottom fish and remove leftovers to preserve good water quality. A varied diet supports body condition and helps maintain the blue coloration.

Essential data

• River of origin: Orinoco basin, Colombia
• Local name used: Blue Phantom Pleco; Blue Phantom
• Origin of the scientific name: Hemiancistrus is the genus name used for this loricariid; sp. indicates that the species is not specified in this designation
• Full-name etymology: Hemiancistrus is formed from Greek roots suggesting a partial or related ancistrus; sp. abbreviates species; L-128 is an aquarium code
• Common/vernacular names: Blue Phantom, Blue Phantom Pleco
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: hee-mee-an-SIS-trus sp. ell one two eight
• Discovery: aquarium reference L-128; individual scientific attribution not indicated
• Maximum adult size: approximately 15 to 20 cm
• Water temperature and pH: 26 to 30 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: oxygen-rich tropical streams, rocky substrates, and submerged wood; vegetation mainly along margins and in calmer sections
• Typical tankmates: Hyphessobrycon columbianus, Hoplisoma metae, Sturisomatichthys aureus, Geophagus steindachneri
• Temperament and behavior: peaceful and secretive, mainly crepuscular and nocturnal; territoriality may occur between males or toward competing bottom fish
• Water depth: shallow to intermediate areas near rocks, wood, and shelters
• Sexual dimorphism: adult males often have broader heads and more developed odontodes on the cheeks and caudal peduncle
• Bottom structure and flow: rocks, gravel, wood, and crevices; moderate to strong flow with high oxygenation

In your aquarium

For success with Hemiancistrus sp. L-128, choose a spacious aquarium with strong filtration and a layout containing rocks, roots, and caves. Keep the water warm, stable, and oxygen-rich, then provide varied foods after dark. Avoid housing it with several large, highly territorial bottom fish. Because these specimens are wild-collected, gradual acclimation and close observation during the first few weeks are recommended. With regular maintenance and suitable retreats, this loricariid can become a long-lived centerpiece in a South American community aquarium.