The tropical house is the house behind the Amazonian Aviary. The Sloth has been up there since June last year ! It's normally open 2 hours a day. In there is a few Fruit Bats, Tortoises and a couple of birds which don't have access to the Aviary. A lot of the Fruit Bats have left as they were on the surplus list. There were Bettongs in there for a while but I believe they have now moved on.
Squirrel Monkeys have been in that exhibit in the Primate house since the summer, although the outside didn't have viewing for a while, but the Sloth moved to the tropical house in June. There hasn't been a Fennec Fox at Safari Zoo for about 4 years now!
The Kangaroo's are now in the walkthrough safari, and the Anaconda is on display in the keeper room next to the Giraffes. It may get moved to the discovery centre at some stage, but that isn't actually open to anyone bar classes yet.