L183 Starlight Bristlenose Pleco The L183 Pleco, or Starlight Bristlenose Pleco (Ancistrus dolichopterus), is a popular freshwater aquarium fish known for its deep black body covered in hundreds of small, white spots, resembling a starry night sky, and often featuring a contrasting white seam along its dorsal and tail fins. This peaceful, omnivorous fish requires a diet of algae wafers, blanched vegetables, and occasional protein-rich foods, and thrives in an aquarium with plenty of hiding spots like driftwood and caves.