The twin "eyes" on its dorsal fin is the reason it is also known as a Signal Goby. But the distinct black ventral and anal fins make it look like it's sitting on four tires. Since this fish likes to build a burrow your substrate should be sugar-sized.This fish will grow to 4".Diet should include enriched mysis and brine shrimp, as well as other small chopped frozen seafoods. May accept high quality flake food. Feed frequently.Provide rockwork for shelter, a sand bed and for best care, use with a refugium.Do not keep with aggressive fish, especially bottom feeders.