Pseudacanthicus sp. L-185

A Little More Information...

Pseudacanthicus sp. L-185, also known as the Evil Cactus Pleco, is a spectacular loricariid from the Rio Xingu in Brazil. Its robust body, bony plates, and spiny outline give it the characteristic appearance of a large cactus pleco. Still commonly offered under a trade designation rather than a complete scientific description, this fish remains a sought-after acquisition for specialized aquarists. It is a wild-collected fish offered exclusively by Ton.Fish in Canada. With a rarity level of 2, it is uncommon and requires a spacious, well-oxygenated aquarium with carefully planned hardscape and shelter.

General species description

Pseudacanthicus sp. L-185 is a large pleco in the genus Pseudacanthicus, adapted to rocky substrates and flowing areas of the Rio Xingu. Like other cactus plecos, it has a powerful body, a ventral mouth suited to grazing, and fins supported by robust spines. It is mainly active at dusk and during the night, when it explores its territory and searches for food. In an aquarium, provide ample bottom space, separate shelters, and strong filtration. Its temperament may become territorial toward other loricariids, especially in confined quarters. This uncommon species is better suited to an experienced aquarist than to someone keeping a pleco for the first time.

Geographic origin and biotope

This form comes from Brazil, in the basin of the Rio Xingu, a river system known for clear rapids, rocky outcrops, and high loricariid diversity. The habitat generally includes slabs, boulders, and crevices where fish can hold position in the current. Aquatic vegetation is often less abundant than in quiet, muddy areas; rocky shelters, submerged wood, and riverside vegetation remain important. In an aquarium, warm, clean, highly oxygenated water combined with strong circulation better reflects conditions associated with the Xingu. The specimens offered here are wild-collected.

Precise locality and local name

The most commonly used trade name for this form is Evil Cactus Pleco, while the L-185 designation identifies it within the aquarium numbering system for loricariids. Its origin is associated with the Rio Xingu in Brazil. In the aquarium trade, the L-185 code remains especially useful because several cactus plecos are still sold under provisional names. This designation does not replace an officially established species name, but it helps identify specimens and compare offerings between suppliers. At Ton.Fish, Pseudacanthicus sp. L-185 is available exclusively in Canada and in limited availability, making it a sought-after fish among pleco collectors.

Appearance and physical characteristics

Pseudacanthicus sp. L-185 has a thick, heavily armoured body, a broad head, a ventral mouth, and well-developed odontodes on the cheeks and body. Its dark coloration, marked with paler spots, contributes to the distinctive appearance of the Evil Cactus Pleco. The fins are also sturdy and may show varying contrast depending on age, health, and aquarium conditions. Its bony plates and spines make handling difficult; use a soft net or rigid container whenever possible. Its adult size requires a large aquarium with several shelters and substantial bottom area. Overall body shape, odontodes, and coloration are its main aquarium identification features.

General diet

This pleco is omnivorous with a strong preference for meaty foods and a varied diet. Offer sinking carnivore pleco pellets, foods containing shrimp or mussel, and complementary vegetable-based foods. Feed after the lights go out, when Pseudacanthicus sp. L-185 becomes more active. Appropriate portions prevent uneaten food from decomposing in quiet areas of the aquarium. A consistent diet combined with good water changes helps maintain condition and growth. Do not rely on algae growing on the glass as its main food source; provide a balanced ration with plenty of variety and adequate protein.

Essential data

• River of origin: Rio Xingu
• Local name used: Evil Cactus Pleco; L-185
• Origin of the scientific name: Pseudacanthicus is a genus name; L-185 is an aquarium trade designation
• Full-name etymology: Pseudo means false; acanthicus refers to spines or thorn-like structures
• Common/vernacular names: Evil Cactus Pleco
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: soo-dak-an-thi-kus - ess pee L one eight five
• Discovery: —
• Maximum adult size: approximately 35 cm
• Water temperature and pH: 26 to 30 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: clear, fast-flowing water, rocky substrate, boulders, crevices, submerged wood, and riverside vegetation
• Typical tankmates: Hypancistrus zebra L-046; Baryancistrus xanthellus L-018; Pseudancistrus asurini L-067; Krobia xinguensis; Scobinancistrus aureatus L-014; Panaque armbrusteri L-027
• Temperament and behaviour: territorial toward plecos using the same shelters; mainly crepuscular and nocturnal
• Water depth: rocky sections of the river
• Sexual dimorphism: odontodes and body development are generally more pronounced in adult males
• Bottom structure and flow: rocks, slabs, boulders, and crevices; moderate to strong current

In your aquarium

To keep Pseudacanthicus sp. L-185 successfully, provide a very large aquarium, oversized filtration, and strong circulation that keeps the water oxygen-rich. Offer several caves of different sizes to reduce territorial disputes. Stable temperature, frequent water changes, and varied nighttime feeding are essential. Because this is an uncommon wild-collected fish, acclimation should be gradual and its body condition monitored closely. Avoid aggressive tankmates and direct competitors for shelter.