Yea, there are 2 rather big holes for air flow at each side of a tank...so I was thinking maybe to put some tape or something over some small part...as I don't want to cut completely air flow...
Pffff, this is rather more gambling I see...first I thought of this humidity issue because snake is refusing to eat since I got him...it will be 25 days now since his last meal....
I forgot to mention, that he also shedded about a week ago, it didn't came off in one piece, but shedding was still complete...
thanks anyway for your reply