Common name: Cobalt Blue Goby.

Species: Stiphodon semoni.

Habitat: Sumatra across much of Indonesia, northern Papua New Guinea and the Bismarck Archipelago as far as the Solomon Islands.

Potential size: 5cm.

Social behaviour: Suitable for community aquariums provided the tank is well oxygenated and there is a good flow.

Food:  Algae, algae wafers, pellets, bloodworm etc.