Thanks for the input guys, I'm glad you think they look healthy. My concern for them stems from the death of the third member of the group a week after I got them and their behaviour (not moving, not eating, not pooping, not hydrating). Well, they have both found a water bowl at least once or twice each now, so that last point may be improving.
I do have two water bowls in there, one is on the floor and the other is half way up (about a meter off the ground on the tree trunk). The male has located the floor bowl twice now and the female the higher one once so this is progress.
Since my last update two days ago, the male has crawled out of the water bowl and has stayed motionless on the floor. A tree frog on the ground is worrying to me.