Anyway, yesterday I placed him in a bowl of warm water and I noticed that he drank. At the moment he doesn't seems to me lethargic.
As regards your point Deborah, I've understood that trying too many times is stressful for the snake, but here in Italy a friend of mine advised me to try every 2 or 3 days.
Of course next time with more experience I'll not make the same mistake, but on the other hand I was worried because of the weight of this snake. The litter mates are 60 grams and more.
As regards the size of the terrarium, could anybody translate in metric? I don't understand what is 6 quarts tub... sorry.
Last but not least I wish to thank all of you guys because you are really helping me a lot.