 As well as the three halls, the aquarium also featured the "Big Fish Tank", which contained large fish species that were all former pets, and had to be rescued because their owners did not have the proper equipment or understanding to look after them.The species in the Big Fish Tank include tambaqui, catfish and pirapitinga.The aquarium closed on 22 October 2019; some animals were moved to a new aquarium at ZSL Whipsnade Zoo, while others were set to be housed in a new corals exhibit in the B.U.G.S building in 2020.