Do Royal Plecos really need to eat wood?

Yes. Wood is a critical part of their diet. They have evolved specialized teeth to shave it and unique gut bacteria to digest it. Without bogwood or driftwood in the aquarium, they will suffer from severe malnutrition and digestive issues.

Why is my Royal Pleco producing so much waste?

Because their diet consists largely of fibrous wood, their bodies pass a massive amount of indigestible material. The resulting sawdust-like faeces are entirely normal, which is why oversized mechanical filtration is mandatory when keeping this species.

Can I keep two Royal Plecos together in the same tank?

It is generally not recommended unless the aquarium is exceptionally large (over 800 litres) with multiple large pieces of wood to break lines of sight. They are highly territorial and will fight other plecos over preferred hiding spots.

How fast does a Royal Pleco grow?

They are incredibly slow-growing fish. While they may grow reasonably steadily for the first couple of years, their growth rate slows down significantly thereafter, taking many years to reach an adult size of 30-40 cm.

Are they safe to keep with planted aquariums?

While they do not generally eat healthy plant leaves, their large size, clumsy nature, and preference for rasping on broad surfaces can easily damage or uproot delicate plants. Sturdy, wood-attached plants like Anubias or Java Fern are better choices.

FreshwaterTropicalIntermediate

Royal Pleco

Panaque nigrolineatus

The Royal Pleco is a magnificent, heavily armoured catfish renowned for its striking longitudinal stripes, bright red eyes, and unique wood-eating habits.

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Ideal Conditions

Temperature: 24 – 28 °C
pH range: 6.5 – 7.5
Hardness: 2 – 15 dGH
Adult size: 30 – 43 cm
Adult minimum: 400 litres+
Lifespan: 10 – 20 years
Diet: Herbivore/Xylivore (wood-eating)
Water flow: moderate to high
Preferred setup: Spacious aquarium with extensive bogwood, heavy filtration, and hiding caves.

About the Royal Pleco

Panaque nigrolineatus, widely known as the L190 or Royal Pleco, is one of the most iconic loricariids in the aquarium hobby. Instantly recognisable by its striking black-and-grey pinstripes and distinctive red eyes, this species boasts an oversized, tadpole-like head and powerful sucker mouth. In addition to being a visual centrepiece, it belongs to a specialised group of xylivorous (wood-eating) catfish. While they grow quite large and demand excellent filtration, their fascinating physiology and robust appearance make them an exceptional long-term pet for the dedicated aquarist.

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Is it right for your tank?

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Where Royal Pleco comes from

Native range

Orinoco River Basin, Amazon River Basin

Countries / regions

Colombia, Venezuela, Brazil

Habitat

Fast-flowing, highly oxygenated river channels littered with submerged trees and driftwood.

Populations exist across a wide swathe of South America, resulting in several regional colour variants.

Similar species

Watermelon Pleco
Panaque sp. L330
Blue-Eyed Pleco
Panaque cochliodon
Dull-Eyed Royal Pleco
Panaque sp. L191

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Congo Tetra
Phenacogrammus interruptus
Peaceful, mid-to-top dwelling dither fish that will completely ignore the pleco's bottom territory.
Great
Altum Angelfish
Pterophyllum altum
A tall, peaceful cichlid that occupies the middle and upper water column without competing for caves.
Great
Sterba's Corydoras
Corydoras sterbai
Peaceful bottom dwellers that generally stay out of the pleco's way, though a large enough tank is needed to ensure adequate grazing space for both.
Great
Common Pleco
Hypostomus plecostomus
The Royal Pleco can be highly territorial towards other large loricariids; immense tank space and numerous distinct sight-breaks are required if mixing.
Compatible with caution
Red Devil Cichlid
Amphilophus labiatus
Highly aggressive large cichlids may continuously harass the pleco, leading to stress and injury despite its armoured plating.
Not recommended

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