I just found a tissue box, cut it in half, and it fit like a glove. Now that I have the space, should I get both the humidity box and a big water bowl, or just one.

On a side note, would it work to upgrade to his adult enclosure (36 by18) when he outgrows the 10 gallon, or should I get an in between size like a 20 long. Would it cause too much stress