Ambligobius rainfordi - This great fish should not be kept with aggressive tankmates, as this is a peafeful fish. Rainford's goby can be very secretive, especially when first added to the tank and will remain hidden if it is picked on. This species is rarely aggressive towards other bottom-dwelling fishes, with the exception of closely related forms. It will do best in a tank that has some filamentous green algae, which it will graze upon. Also helps keep your sandbed clean.