Physical description: Signigobius biocellatus is a small (3-4 inch) goby that features two black spots on each side of its dorsal fins, giving it its name. Its colorful pelvic fin (blackish with blurplish dots) serves as a perch of sorts as the fish moves about the substrate. It features a brownish stripe on its face that runs across its eyes and a white and mottled brown skin color. The anal fin also features blurplish dots as well.
Range: The twinspot goby can be found in the Western Pacific, including the Philippines, the Solomon Islands, Vanuatu, southern Great Barrier Reef, Palau in Micronesia and Indonesia
Care considerations: The twinspot is a sand sifter, and as such, it is imperative that you have live rock and live sand in your tank. It is not as destructive as a diamond goby, a larger goby that can bring down your rockscapes and upend corals. Keep the twinspot goby with other peaceful fish and keep in mind that this bottom dweller can’t compete with fish in the upper regions of the water column come feeding time. Live copepods are a must. Small frozen mysid shrimp and other small meaty foods are suggested. While pellets are often recommended, they need to be small enough to fit into their mouths, and even when this is the case, they often spit them out or expel them through their gills. They don’t seem to care much for foods of harder consistency. When feeding frozen mysid shrimp, it is extremely beneficial to turn off the pumps and any other water motion devices and either use a device such as Julian’s Thing, which works very well, or ensure the shrimp reach the bottom. Some prefer to feed the twinspot in the same corner of the tank, in the belief that it knows where to go come feeding time. To distract other fish in the tank, you can feed them floating flake foods or other type foods as the mysid shrimp settle to the bottom or you target feed the twinspot goby. The twinspot goby is a peaceful fish that should be kept with other peaceful fish. It won’t do well with other sand sifting gobies and would probably perish due to competition. The twinspot goby is an endearing little fish, but it probably is best left on the reef.