elisa20,
Your new fish i called a Yellow-Spotted Bandfish-
(Acanthocepola breviata) of the family Cepolidae, and attains a length of 20 cm. These fishes are burrow dwellers, closely related to Tilefish. They act very similar to Jawfish, so like AuroraDrvr stated they require a deep substrate, composed of very fine sand or even muddy sand, as they inhabit silty mud flats in certain regions of Indonesia. They hover over their burrow and capture small crustaceans and other meaty foods that pass by. Their large eyes would indicate that the fish prefer subdued lighting and are more nocturnal in nature becoming more active at dusk.
From my experience with these fishes they are rare in the aquarium trade, and oftentimes arrive with tail or mouth damage due to trying to escape and retreat from the confines of their holding containers or from constant irritation in shipping bags. They will try and leap from the aquarium so a good lid is a must. Maintain with very docile, non-threatening fishes that are not overly active.
Good luck with you new fish, they are very unique.
Cheers!