A stunning, large-growing pleco famous for its red eyes, grey/green coloration, and dark horizontal stripes. Belonging to the genus Panaque, they are xylophagous (obligate wood-eaters); real driftwood in the aquarium is absolutely essential for their digestion and survival. They produce extreme amounts of sawdust-like waste and require heavy, high-flow filtration.
At a Glance
Tank Requirements
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Water Parameters
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Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard (Adult)
The fully grown adult form. Requires a massive aquarium, extremely heavy filtration to handle wood waste, and a large established territory.
Differs in 1 trait from base species
Also known as: Adult Royal Pleco, Full Grown
Juvenile (Grow-out)
Small juveniles commonly sold in stores. While they start small and can temporarily be kept in smaller aquariums, they will eventually require a massive tank. They must have access to driftwood immediately.
Differs in 6 traits from base species
Also known as: Baby Royal Pleco, Small L190
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🟢Ideal Tank MatesRoyal Pleco (L190) Care Guide Summary
The Royal Pleco (L190), scientifically known as Panaque nigrolineatus, belongs to the Catfish family group. Adults reach a maximum size of approximately 43 cm and have a depressed body shape with a slow growth rate. Classified as semi-aggressive, this species primarily occupies the bottom zone of the aquarium and produces a extreme level of biological waste.
To thrive, the Royal Pleco (L190) requires a freshwater only aquarium with a minimum volume of 450 litres and a tank length of at least 150 cm. Water temperature should be maintained between 22°C and 28°C, with a pH range of 6.5–7.5 and a general hardness of 5–15 dGH. A high water flow is preferred. An aquarium test kit can help you monitor these values.
The Royal Pleco (L190) is a rewarding species to keep, provided its core environmental needs are met. This species is available in 2 varieties: Standard (Adult) and Juvenile (Grow-out). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Royal Pleco (L190) Habitat Setup
When setting up an aquarium for the Royal Pleco (L190), a high water flow best suits their natural preferences. Because this species occupies the bottom zone, the aquarium layout should prioritise sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include driftwood, which can serve as both a hiding place and a dietary supplement. Keepers should note that live planted layouts may be difficult to maintain, as this species tends to uproot or consume vegetation.
Royal Pleco (L190) Compatibility Notes
Classified as semi-aggressive, the Royal Pleco (L190) is best housed alone, as they do not tolerate others of their kind in confined spaces. When choosing tankmates, conspecific aggression can be intense, especially in smaller tanks and territorial behaviour may cause issues if hiding spots or floor space are limited. Selecting tankmates that favour different water layers from the bottom zone can help reduce competition and territorial overlap.
Frequently Asked Questions About Royal Pleco (L190)
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Similar Species
Clown Pleco (L104)
Panaqolus maccus
A popular, distinctly striped dwarf pleco native to Venezuela. It is a strictly wood-eating species (xylivore); real driftwood is mandatory for its survival and digestion. Because of this diet, it produces massive amounts of sawdust-like waste, requiring excellent mechanical filtration despite its small size. They are shy and predominantly nocturnal.
Common Pleco
Hypostomus plecostomus
A heavily armored, nocturnal catfish famous for eating algae. However, they grow incredibly large, produce massive amounts of waste, and frequently outgrow standard aquariums. They require driftwood in their diet for digestion. As they age, they may become territorial or develop a taste for the slime coat of slow-moving, flat-bodied tank mates.
Gold Nugget Pleco (L018)
Baryancistrus xanthellus
A stunning, highly sought-after Loricariid native to the fast-flowing, highly oxygenated waters of the Rio Xingu in Brazil. They feature a dark body covered in bright yellow spots with thick yellow seams on their dorsal and caudal fins. They require high temperatures, high water flow, and a diet rich in biofilm, aufwuchs, and fresh vegetables. They are notoriously territorial towards other bottom-dwellers.
Bristlenose Pleco
Ancistrus cirrhosus
A highly popular, hardy, and relatively small suckermouth catfish. Excellent algae eaters that stay much smaller than Common Plecos, making them suitable for standard aquariums. They require dietary wood (driftwood) to aid in digestion and plenty of hiding caves.
Zebra Pleco (L046)
Hypancistrus zebra
A highly sought-after, strikingly beautiful black-and-white striped pleco endemic to the fast-flowing Xingu River in Brazil. Unlike common plecostomus, it is primarily carnivorous (a micropredator) and will not clean algae. They are notoriously shy, slow-growing, and require highly oxygenated, warm water with vigorous flow to thrive.
Golden Wonder Killifish
Aplocheilus lineatus
A large, incredibly hardy, surface-dwelling killifish. The 'Golden Wonder' is a selectively bred bright yellow morph of the wild Striped Panchax. They are notorious predators with surprisingly large, trapdoor-like mouths; they will easily consume neon tetras, guppies, and dwarf shrimp. They are completely peaceful with fish too large to eat, but require a tight-fitting lid as they are expert jumpers.