The Shimmering Shells Winx Club : Season 5 Episode 7

After suffering a humiliating defeat at the hands of the Twisted Sisters, and Tritannus, the girls all head to Aishas underwater world to visit personally with her uncle Neptune. There they meet Pescies, who are the Underwater Pixies of the Sea. The Winx try to get the 'mystical stone: self-confidence" as part of their mission for Sirenix.