THanks for that Zooish, Is the freshwater park being planned by the Green Chapter? i love their work!
They'll probably have a hand in designing some of the tank displays; they've already done a number of aquarium and vivarium displays for the zoo, night safari and birdpark.
The freshwater attraction (tentatively labelled as the "River Safari" project) goes beyond fish, and will have its main focus on mammals which live in or around water. It will cover about 10 hectares. It is being planned to incorporate a boat ride on the reservoir which will allow viewing of exhibits built along the shore, in addition to many underwater-viewing galleries viewed on foot.