This is the aquarium's first permanent amphibian display. It houses 5 species of Poison Arrow Frogs (Dendrobates auratus / leucomelas / tinctorius, Phyllobates terribilis, Ranitomeya amazonica), Neon Tetra and Spotfin Hatchetfish.
@Zooish, whereabouts is this in the aquarium?
EDIT: sorry, just saw the comment on the other photo that answers this question! Looks like a nice exhibit.