A few months ago, the news of a tool-using fish was spread (for more information about it, as well as about tool-use in other animals and the definition of tool-use, check this post). Now, a closely related species, the orango-dotted tuskfish (Choerodon anchorago), has also been observed using tools. More specifically, the fish cracked bivalves using a rock as anvil. And it's been filmed.               
    

    
Reference
Bernardi, G. (2011). The use of tools by wrasses (Labridae). Coral Reefs. Published online 20 September. doi:10.1007/s00338-011-0823-6. (Click here for a preview)