The temps in the rain chamber have been exactly the same as in their vivarium. I have also kept a looped CD with 3 different Whites Tree Frog calls which they respond well too and the rain cycle is from 4 - 8:30pm. The youngest and smallest male has been the most vocal and is almost distracting the other 2 males. Whenever the other males call he gets over excited and tries to mount them. He has tried several times with the female but she always makes a small soft croak to tell him to get off and then squirms away. I don't know why she is doing this, because it looks like she has eggs in her and he is the most vocal and most consistent caller of the group. I am wondering if I should take them out for a 2 week period and then put them back into the rain chamber. They have been in the rain chamber for 7 days now.

This is what I mean by him mounting the male:

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And here is the female who seems to shy away from him, I also just 'circled' the area that I suspect to have eggs, it is a darker area and you can almost see the eggs on her flanks.
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Sorry for the crappy photos, snapped them with the iPhone. Any advice from anyone to increase breeding chances would be greatly appreciated.