from the site: http://www.flaquarium.org/event-calendar.aspx

October 26, 2014
4pm – 8pm

Join us on the only day we let wild animals, ghosts and princesses roam the aquarium- Guppyween! Trick-or-treat tank-to-tank among over 20,000 sea creatures, making for the perfect family-friendly Halloween event. Entertainment and treats will be provided, so come dressed in your best costume!

Kids in Costume: $5
Adults (age 12yrs and older): $15
Florida Aquarium Members: Free Admission