Green Aeneus Corydoras Green Aeneus Corydoras (Corydoras (Osteogaster) aeneus) is A variant of Corydoras (Osteogaster) aeneus with an intensified green-teal metallic sheen across the flanks — a deeper, cooler-toned coloration than the standard bronze form. One of the most widely kept and best-loved catfish in the freshwater hobby, Corydora