Hi Radim!
I offer the females a segment of
Reynoutria japonica or
Heracleum mantegazzianum. Just cut 2 holes in it, place it in one corner of the tank and the
Gonatodes albogularis will lay the egg in there. But you have to be sure, that you don´t mist into the segment - they don´t like wet places to drop the eggs. If your terrarium is high, you can also use more than one segment and the female has the chance to choose a segment with the optimal incubation-temperatur.
Here´s a pic of a
Reynoutria japonica segment with "entry-holes":
Dateianhang:
Eiablageröhre.JPG [ 127.24 KiB | 12555-mal betrachtet ]
..and one pic in the tank:
Dateianhang:
Eiablageröhre in Terrarium.JPG [ 137.2 KiB | 12554-mal betrachtet ]
You can find these plants nearly everywhere in europe. They are neophyts from other parts of the world and it´s helpful for the nature if you will cut them
Greetings
Dennis
PS: The idea comes from Sacha, i hope he won´t be angry that i posted it earlier