Koumansetta rainfordi, the Court Jester Goby,Old glory, is a species of goby native to tropical reefs of the western Pacific Ocean where it occurs at depths of from 2 to 30 metres (6.6 to 98.4 ft). This species can reach a length of 8.5 centimetres (3.3 in) SL. It can also be found in the aquarium trade.