The Corydoras esperanzae lives in the demersal, freshwater, pH range: 6.0 - 8.0, dH range: 2 - 25 environment.
Actually Corydoras esperanzae is a synonym of Corydoras concolor and when the trade keep resurrecting synonyms it only adds to the confusion. More
Corydoras esperanzae Castro, 1987:34-36 (Colombia, Cano Orocue at Orocue, Río Meta, Casanare - 04°49'N, 71°20'W). Corydoras evelynae Rössel, 1963:360-362 (Brazil, AM, upper rio Solimões). Corydoras filamentosus Nijssen & Isbrücker, 1983b:77 (Suriname, Nickerie, Corantijn river basin - 03°42'N 57°42'W). More
Metanmonninen in Finnish (suomen kieli)