A week ago we introduced a new female to our 2.1 group. We were allready increasing the humidity, but it had little effect on the very large female. The new female's a bit smaller, but as they get sexually mature after 7 months I don't think this is a problem. After one day the males started to chant a lot more than usual and my gf could make this pictures:
(Check the much larger female at the front)
(Check the white goo at the entrance of her pouch)
She also found this on one of the leaves. Maybe an egg that fell out of her pouch?
I'm starting to hope for a succes, but we can be sure after the tadpoles are deposited in the water.