Family: Gobiidae
Formosa Brook Goby — a Gobiidae from China, peaceful but territorial toward its own kind. Reaches 4.7–6.8 cm; a bonded pair claims one cave; keep others elsewhere. 18–26 °C.
Rhinogobius formosanus is a Gobiidae from China. In the wild it prefers shallow streams and estuaries over sand; in the aquarium it stays peaceful but territorial toward its own kind. Plan on 4.7–6.8 cm of adult fish at 18–26 °C. Related profiles: Rhinogobius brunneus, Rhinogobius cliffordpopei, Rhinogobius flumineus.
Difficulty: moderate. Peaceful but territorial toward its own kind. A bonded pair claims one cave; keep others elsewhere.
Hold 18–26 °C and keep it stable — 18–26 °C typical for the genus. Stable temperate range.
Full size is 4.7–6.8 cm. Minimum tank: 55 L, with open swimming space along its bottom-dwelling habits.
Small carnivore — live, frozen and fine sinking foods. Feed two small meals a day rather than one large one.
Peaceful but territorial toward its own kind. Recommended tankmates: Non-goby bottom fish — Ignore its territorial posturing. Avoid Large aggressive fish — Shatter its sense of cover.
Comes from China: shallow streams and estuaries over sand. Expect still to gentle current and moderate.
Not a noted jumper — a standard cover still keeps dust and spray in.
Hidden-clutch spawner with paternal care. Males larger and more colourful.