Family: Eleotridae
Crested Gudgeon — a Eleotridae from Indo-Pacific estuaries, calm bottom resident with clear territory boundaries. Reaches 11.2–16.5 cm; singly or in pairs; every fish needs its own refuge. 22–28 °C.
A Eleotridae species native to Indo-Pacific estuaries: Butis koilomatodon lives middle of the water column over warm freshwater streams and lakes. Calm bottom resident with clear territory boundaries. Adults reach 11.2–16.5 cm. It is one of the aquarium-kept Butis species we profile, alongside Butis butis.
Difficulty: moderate. Calm bottom resident with clear territory boundaries. Singly or in pairs; every fish needs its own refuge.
Set the heater to 22–28 °C and avoid swings. pH 7–8, GH 9–19 dGH suit it.
Full size is 11.2–16.5 cm. Minimum tank: 327 L, with open swimming space along its middle of the water column habits.
Meaty foods; train onto frozen then pellets. Feed two small meals a day rather than one large one.
Calm bottom resident with clear territory boundaries. Recommended tankmates: Non-goby bottom fish — Ignore its territorial posturing. Avoid Large aggressive fish — Shatter its sense of cover.
Comes from Indo-Pacific estuaries: warm freshwater streams and lakes. Expect still to gentle current and moderate oxygen levels.
Not a noted jumper — a standard cover still keeps dust and spray in.
Cave or crevice spawner; the male guards the eggs. Subtle external differences.