He'll be able to breathe. Adding maybe 6 holes on top should probably.solve the humidity problem as humidity flows upwards. My cage spikes to 80% sometimes when I spray it but then it goes down quickly because I have a heat lamp and an 8 in x 8 in meshed square on the lid. My bin is the 110 quart Steriilite bin. Same area as the 41 quart but it's taller.
0.1 Super pastel