The reptile tanks by the cafe where the old Elephant House was. The closest tank is for Bell Frogs and has been in continuous use, but the other three have been empty for about three years (!). Originally the tanks housed Blue-tongue, Cunningham, and Shingleback Skinks, and Eastern Water Dragons. One tank has been empty since mid-2019, the other two since the start of 2020.
I don't think any of the three have their inhabitants yet - I couldn't see any lizards in them and there were no food or water dishes - but the furthest one is now signed for Blue-tongue Skinks, the next for Cunningham Skinks, and the next (definitely still empty) for "carnivorous plants".