@DelacoursLangur well, I went when they first opened for the day and honestly there was no smell. I saw at least 10 people cleaning pretty much everything, so if there is one thing to say for this place it is that they keep it clean - at least when it first opens for the day.
This exhibit has had quite the transformation, as one can see a Smooth-fronted Caiman resting on the pool's edge in my photo from 2015. I wonder what happened to the two big 'crocodilian jaws' statues?