I had the same problem. Take out like 3/4 of his bedding, push the remaining bedding to one side, and use paper towels for the rest if the cage. If humidity goes too low (check a half hour after changing the set up), add a handful of more bedding. Get a large tray or the old tank and put the bedding on there. Let it air out in the house for a few days, because it's too wet to use. You should probably keep the bowl in the cool side of the cage.
0.1 Super pastel