The Royal Pleco (Panaque nigrolineatus) is a large, impressive freshwater catfish known for its striking pattern, wood-eating habits, and peaceful temperament. Ideal for experienced aquarists with large aquariums, it is highly valued for its unique appearance and algae-control abilities.
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The Royal Pleco (Panaque nigrolineatus) is a large, impressive freshwater catfish known for its striking pattern, wood-eating habits, and peaceful temperament. Ideal for experienced aquarists with large aquariums, it is highly valued for its unique appearance and algae-control abilities.
Large, robust body with bony plates covering its length. Dark brown to black base with striking white or light-colored stripes along the body. Flattened sucker mouth for scraping algae and wood. Broad pectoral fins and a tall dorsal fin give it a regal appearance. Adults reach 17–20 inches in length.
15–20 years with proper care
Omnivorous wood-grazer; primarily consumes driftwood, algae, and biofilm. Supplement with sinking algae wafers, blanched vegetables (zucchini, cucumber, spinach), and occasional protein-rich foods like bloodworms, shrimp pellets, or chopped seafood.
The Royal Pleco is a stunning, large, and peaceful pleco that thrives in spacious aquariums with abundant hiding spots and driftwood. While not suitable for beginners due to its adult size, its striking patterns and algae-grazing behavior make it a spectacular centerpiece in large freshwater setups. With proper care, it can live for decades and remain active and healthy.
Moderate to Advanced – requires very large aquariums, stable water parameters, and careful feeding.
200+ gallons for adults (juveniles require at least 75 gallons)
6.5 to 7.5
5–20 dGH
74–82°F (23–28°C)
17–20 inches
Large peaceful fish such as silver dollars, large tetras, cichlids, angelfish, and gouramis. Avoid small fish that may be eaten or stressed.
Very small fish, aggressive species, or other large bottom-dwellers if the tank is not spacious enough. Avoid overcrowding or aggressive fish that compete for food or territory.
Panaque nigrolineatus
Loricariidae
South America – Amazon Basin rivers and tributaries; prefers rocky or driftwood-rich areas.
Semi-solitary; peaceful with midwater and surface fish, territorial with other large bottom-dwellers in confined spaces. Requires sufficient hiding places to reduce stress.
Feed primarily on driftwood and algae wafers. Supplement with blanched vegetables such as zucchini, cucumber, and spinach. Provide occasional protein-rich foods like bloodworms, brine shrimp, or chopped seafood 1–2 times per week. Ensure food reaches the bottom where they feed.
pH: 6.5–7.5, Temperature: 74–82°F (23–28°C), Hardness: 5–20 dGH, Ammonia/Nitrite: 0 ppm, Nitrate: <20 ppm
Sensitive to poor water quality, ammonia spikes, or copper-based medications. Prone to infections if stressed or overcrowded. Requires a balanced diet to prevent malnutrition.
Generally peaceful and nocturnal. Active primarily at night, grazing along surfaces for algae and biofilm. Territorial with other large bottom-dwellers, but coexists peacefully with midwater and surface community fish.
The Royal Pleco (Panaque nigrolineatus) is native to rivers of South America, including the Amazon Basin. It is a large, armored catfish that can reach 17–20 inches in length, making it unsuitable for most home aquariums unless very large. Known for its distinct black-and-white striping, it grazes on driftwood and algae, contributing to tank maintenance. Royal Plecos are hardy, peaceful, and long-lived but require large tanks with strong filtration, hiding spots, and driftwood for grazing. Their unique appearance, size, and wood-eating habits make them highly desirable among experienced aquarists who can accommodate their needs.