On Gabriela's birthday, Laura is with her little sister when she chooses her long-awaited gift: a little fish. But things take a turn for the worse when Laura forgets the little fish's aquarium at a theater, making her anxious about when someone will notice it's missing. Based on the theme of sisterly love, this short film explores the emotional universe of a child by focusing on the main character's feelings and her concerns. But, more than anything, Aquarium is about the love that two sisters feel for each other – which is bigger than anything and everything.

A struggling actress must find a way to deal with her harsh director's demands and give a performance of a lifetime.