The collection in the Reptile House was small but most of the terrariums were quite large (except for those for turtles, all of which were housed very poorly indeed in little fish tanks). Unfortunately the labelling was very deficient throughout. There were quite a few tanks for tropical fish (common home aquarium species), five species of chelonians, two species of pythons, and water monitors. There was also one amphibian on display, a Himalayan crocodile salamander. A species list is included in the review thread.
See here for a review of my visit (in January 2014):
http://www.zoochat.com/2182/zoos-burma-5-naypyitaw-zoo-14-a-362193/