Thanks to their adaptation to very low-light environments, the Black Ghost Knifefish is usually a freshwater fish with a novel overall look. They don't have any scales like other freshwater species. As a result speakers of British English typically use "shoal" to describe any grouping of fish, and speakers of https://stingrayfishonline.blogspot.com/2022/10/how-to-set-up-aquarium.html