Benjamin's Woodcat

Entomocorus benjamini is one of the smallest members of the Auchenipteridae, rarely exceeding 6 cm in total length. It is native to Amazon tributaries in Brazil and is characterised by a bold dark lateral stripe on a pale background, making it visually striking despite its small size. Its tiny, compressed body allows it to exploit the narrowest of wood crevices as daytime refuges.

In the aquarium, Entomocorus benjamini is an endearing species whose secretive daytime behaviour contrasts with active nocturnal foraging. It requires a tank with very thin-gap wood hides — sections of bamboo or bark with narrow splits work well — in which it can be completely concealed during the day. At night it emerges to search for small invertebrates and fallen micro-foods.

This species is entirely peaceful and best kept with other small, peaceful community fish such as nano tetras, pencilfish, and small corydoras. Its diminutive size means it must be fed appropriately small foods — micro-pellets, frozen daphnia and bloodworm, and brine shrimp. A fascinating species for the specialist auchenipterid enthusiast or nano predator tank.

Water: 22–27°C, pH 5.8–7.2, soft to moderately hard (GH 2–12). Tank: 60 L minimum; bamboo or narrow-crevice bark hides; leaf litter substrate; subdued lighting. Feeding: Micro-pellets, frozen daphnia, bloodworm, brine shrimp nauplii; feed after lights-out. Breeding: Internal fertilisation; not reported in captivity. Compatibility: Peaceful; best with nano tetras, pencilfish, and small corydoras.