@ kindai: sorry I do not have a digital camera.
today the larvae are swimming free, but some individuals died during the night. The larvae are very shy and swim very wild through the aquarium when they see me. I feed them with paramecium and rotatoria. In the morning, I made a water change (50%) with water from the Paro-aquarium and added some java moss.
Then I put the cave back to the adults – one minute later the male occupied the cave again and became black. I think they will breed again in a few days…