Here are some of the most popular freshwater fish species that are commonly kept in aquariums, each with unique characteristics and care requirements.
A common rule of thumb for how many freshwater fish you can keep in an aquarium is to allow about 1 inch of fish per gallon of water; however, this can vary depending on the specific fish species, their adult size, activity level, and bioload, with heavily planted or densely stocked tanks often needing more filtration and swimming room.
Overview The Clown Loach (Chromobotia macracanthus) is a bright orange loach with black bands. It is very popular, but often bought without knowing how big it gets. Native to rivers of Borneo and Sumatra in Indonesia. Can reach about 16 in (40 cm), though it grows...
Overview "Gold Piranha" is a trade name for Serrasalmus maculatus, also called the golden mac. The name is sometimes applied to other Serrasalmus species. Widespread in the Amazon, Paraguay and Paraná basins of South America. Grows to about 8 in (21 cm) standard...
Overview The Red-bellied Piranha (Pygocentrus nattereri) is the most famous piranha, silver with a red belly. Found through much of the Amazon basin, plus the Essequibo and the Paraná–Paraguay system. Grows to about 14 in (35 cm) standard length. Illegal to own in...
Overview The Zebra Loach (Botia striata) is a small botiid with fine yellow and dark stripes. Native to the Western Ghats region of southern India, described from the Tunga River. Grows to about 3.5 in (9 cm) standard length. Probably the best Botia for general...
Overview The Yoyo Loach is usually sold as Botia almorhae. Its pale body has dark markings that can look like the letters "YOYO." Many trade fish may be B. lohachata or related species. The true appearance of B. almorhae is unclear. Native to northern India and Nepal....