The Cactus Pleco (Baryancistrus sp. L-18) is a medium to large freshwater catfish prized for its dark body adorned with bright yellow or golden spots resembling cactus spines. It is peaceful, nocturnal, and thrives in well-structured aquariums with caves, driftwood, and hiding spaces.
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The Cactus Pleco (Baryancistrus sp. L-18) is a medium to large freshwater catfish prized for its dark body adorned with bright yellow or golden spots resembling cactus spines. It is peaceful, nocturnal, and thrives in well-structured aquariums with caves, driftwood, and hiding spaces.
Flattened, armored body with a dark brown to black base color and bright yellow/golden spots resembling cactus spines. Broad pectoral and caudal fins, and a large sucker mouth. Adults reach 7–10 inches. Males develop small odontodes on pectoral fins during breeding.
10–15 years with proper care
Omnivorous; primarily grazes on algae and biofilm. Supplement with sinking algae wafers, blanched vegetables (zucchini, cucumber, spinach), and protein-rich foods such as bloodworms, brine shrimp, and shrimp pellets.
Cactus Plecos are an excellent choice for aquarists seeking a visually striking, peaceful, and active bottom-dwelling catfish. Their unique pattern, manageable size for medium to large aquariums, and nocturnal behavior make them both decorative and functional.
Moderate – requires large tanks, proper diet, hiding spaces, and stable water parameters.
55+ gallons (larger recommended for multiple individuals or community setups)
6.5 to 7.5
5–15 dGH
74–82°F (23–28°C)
7–10 inches
Peaceful midwater and surface community fish such as tetras, rasboras, gouramis, and dwarf cichlids. Avoid aggressive or very small species.
Aggressive or overly boisterous species, very small fish, or other large territorial bottom-dwellers without adequate hiding spaces.
Baryancistrus sp. L-18
Loricariidae
South America – Rio Xingu, Brazil; inhabits rocky and driftwood-rich rivers.
Semi-solitary; peaceful with other species. Males may guard caves during breeding.
Feed primarily on algae wafers and biofilm. Supplement with blanched vegetables such as zucchini, cucumber, and spinach. Provide occasional protein-rich foods such as bloodworms, brine shrimp, or shrimp pellets. Ensure food reaches the bottom where they graze.
Cactus Plecos are cave spawners. Males guard eggs in a secure cave while females leave. Fry become free-swimming after several days. Conditioning with protein-rich foods improves breeding success.
pH: 6.5–7.5, Temperature: 74–82°F (23–28°C), Hardness: 5–15 dGH, Ammonia/Nitrite: 0 ppm, Nitrate: <20 ppm
Sensitive to poor water quality. Can develop ich, fin rot, or bacterial infections if stressed. Stable water conditions and a balanced diet are essential.
Semi-solitary; peaceful but may show mild territorial behavior with other bottom-dwellers. Nocturnal and primarily bottom-dwelling.
Native to South America, particularly the Rio Xingu and surrounding tributaries in Brazil, the Cactus Pleco is admired for its unique golden spotting pattern on a dark armored body. Adults reach 7–10 inches, requiring large aquariums. They are bottom-dwelling, nocturnal, and peaceful, needing caves, driftwood, and moderate water flow. A varied diet of algae, vegetables, and protein-rich foods ensures health, vibrant coloration, and active behavior. Regular water maintenance is essential to prevent stress and disease.