It looks just like a Gold Neon Goby. They're great for the tank. They clean off of parasites, are active, colorful, and they are very interesting. The gold ones are not cheap fish. I remember when I got a Pajama Cardinalfish in with my chromis. I took it back to the store though.
Also, I love Kole Tangs. I have one in my 90, and it is a great "centerpiece fish". They also keep the algae down. Congrats on the new fish!
90 Gallon Reef - 3 Blue-Green Chromis, 2 Ocellaris Clowns, 1 Kole Tang, 1 Midas Blenny, 1 Longnose Hawkfish, 1 Zebra Dartfish, 1 Algae Blenny, 1 Six-Line Wrasse
29 Biocube Reef - 1 Chalk Bass, 2 Black and White Clownfish, 1 Yellow Watchman Goby, 1 Fire Goby