Great... my queen has passed away
and it was the silicon now i know it... i checked the water bowl, and when it completely dried out, i found SILICON(!!!) on the bottom. I found dried SILICON spots precipitated on all sides ... so after all i was right, the Silicon melted into the Ytong, suffocating my queen inside...
I even suspect that the silicon precipitated onto the ant queen herself, and that was what killed her ultimately...
I would STRONGLY recommend to remove the silicon as an ingridient from your site as part of the Ytong set....