Giant Kokopu Tank in the Night Forest at Te Wao Nui, Auckland Zoo.
This was basically the only photo I took in the Night Forest, and is towards the exit, past the main Kiwi/Bat exhibit and smaller reptile/invertebrate exhibits. There was, unfortunately, no signage up fotr this tank, although there was for the two smaller tanks behind where the photo was taken. I'm pretty sure the fish in here (think there was only one) was a Giant Kokopu.
Te Wao Nui Review here:
http://www.zoochat.com/17/te-wao-nui-review-236615/