Ancistrus ranunculus

Ancistrus ranunculus is a remarkably distinct species of bristlenose catfish native to the fast-flowing, rocky reaches of the Xingu River in Brazil, characterized by its exceptionally flattened body profile and the elaborate, fleshy tentacles that adorn the snout of mature males. Frequently referred to as the Medusa Pleco within the aquarium hobby, this species has evolved to thrive in high-oxygen environments with significant water movement, making the implementation of powerful filtration and supplemental aeration essential for its long-term health in captivity. Providing an abundance of narrow rock crevices that mimic its natural hiding spots, alongside a varied diet of high-quality sinking wafers and protein-rich supplements, is the primary requirement for maintaining this sensitive Loricariid, as its unique physiology demands stable water parameters and a stress-free environment to fully display its cryptic yet fascinating behavior.