Well, the closest anyone got was that it was a blenny, it was the Butterfly goby and reaches 10" long. fairly common in the pet trade,
this next might be easier, currently sold at about $25 US, a good fish for a nano tank, only gets about 2 1/2 " long and is a peaceful eater of mysids and algae. It is supposed to be almost as hardy as the damsel fishes so it might be a good first fish for a tank.