Hi maritn
congratulations on breeding the moonlight gourami. It is a very spledid spedies. I remember way back i had bred the golden gourami. And i had bred them in winter. I rememher i had to lower the height of the water, so that the fry would have a layer of air to breed from. I had read it was important to keep the air above the water warm, as the fry come up to the top to breathe. I had left an clear area for the male to make the nest and half o the tank i had put it a lof or plastic plants. The reason was after breeding the male chases the female away, and that way she had where to hide, after breeding.
I remember i had hundreds of fry and they many survived. The problem was to find them homes once they started to grow up as i did not have muxh space to keep them.
Hope you will post some photos of they fry
Frank