Too small of a tank? its a 6 feet long by 2 feet high by 2 feet deep. He is only 8 feet long right now. When he grows another foot or 2 my dad is going to build me a 10 x3x3 tank....i didn think his tank was too small and my tanks humidity stays around a constant 55-65% with the heat lamps included. I never have a problem with humidity in my tanks all my tanks stay at the right level with just a misting every once and a while and some moss. only time i have to really do some work on the humidity is when they are in shed at that point i put automatic misting machines into their tanks