Magnum Plec L047 Care Guide - Setup, Diet & Breeding

The Magnum Plec, commonly sold as L047, is a large and impressive loricariid catfish with a broad, heavily armoured body. Its base colour ranges from dark brown to nearly black, contrasted by vivid yellow-gold edging on the fins and a distinctive golden seam along the body. The pattern can become especially striking under aquarium lighting and in healthy adult specimens.

Like many riverine plecos, this species is primarily nocturnal and spends much of the day resting on rocks, wood or the walls of caves. It uses its powerful sucker mouth to grip firm surfaces in strong current, while its armour and defensive fin spines provide protection from predators and territorial rivals.

In the wild, Magnum Plecos inhabit the rocky rapids and runs of the Rio Xingu. These habitats are highly oxygenated and contain relatively little fine sediment, with algae, biofilm and small organic particles growing across sunlit stones. Seasonal changes in river level and flow are thought to influence feeding and reproductive activity.

L047 belongs to Baryancistrus, a group of robust South American suckermouth catfish prized by specialist aquarists. It is not a small community pleco: adults become substantial, powerful fish and need considerably more space than the common bristlenose pleco. Its bold markings and unusual golden trim make it one of the most desirable large loricariids from the Xingu region.

Baryancistrus chrysolomus is native to the Rio Xingu basin in Pará, northern Brazil, South America. It is associated with clear, fast-flowing sections of the river, where it clings to rocks and feeds among submerged surfaces.

A single adult should have an aquarium of at least 300 litres, with a footprint around 150 × 60 cm; larger dimensions are preferable because this is a bulky, active-bottom-dwelling catfish. Use powerful filtration, excellent oxygenation and strong circulation, while keeping the water clean and stable. Provide smooth rocks, substantial pieces of driftwood and several caves or overhangs large enough for the fish to turn around in. A sand or fine rounded-gravel substrate is suitable, with open rocky areas for grazing and no sharp décor that could damage its underside or fins.

Up to about 35 cm (14 in) in total length. Females are often slightly shorter and less bulky than mature males, although final size varies with sex, diet and growing conditions.

This species is an omnivorous grazer with a strong preference for algae, aufwuchs and biofilm. Offer high-quality algae wafers and sinking herbivore foods, supplemented with blanched courgette, cucumber, spinach or green beans. It also benefits from occasional meaty foods such as insect-based pellets, shrimp foods or frozen foods, particularly when young or growing. Feed after the lights dim, remove uneaten fresh food promptly and do not rely on naturally occurring algae alone.

Magnum Plecos can live with peaceful, robust South American community fish such as large tetras, peaceful eartheaters, severums, larger Corydoras and non-aggressive characins. They may also be kept with other calm riverine catfish when the aquarium provides ample floor space and separate shelters. Avoid housing them with aggressive cichlids, fin-nipping species, highly boisterous feeders or other large territorial plecos competing for caves and grazing areas. They are generally best kept singly unless a very spacious aquarium is available.

Magnum Plecos are cave-spawning catfish, although captive breeding is uncommon and generally attempted only by experienced aquarists. Provide several snug caves made from slate, ceramic or smooth rock, with strong, well-oxygenated flow through the breeding area. A mature male usually claims a cave and guards the eggs after spawning, while the female deposits a batch of adhesive eggs inside. The male fans and protects them until they hatch, after which the fry can be offered powdered or soft vegetable-based foods alongside suitable algae-rich foods.

Mature males are usually larger and more heavily built, with stronger bristles or odontodes on the cheeks, along the sides of the head and sometimes across the body. Females tend to have a broader, rounder abdomen and noticeably fewer head odontodes. These differences are subtle in young fish and become clearer once the fish are mature.