My two are housed in a 100 gallon tank, I think that its something like 5 feet long, 1.5 feet wide and 2 feet tall. I'm using play sand as a substrate. I've also got a lot of rocks. Since my room is on the second floor, I wanted to try to keep the weight down so I incorporated a big cork tube, cork slab, and a big clay flower pot. I also got one of those big sand blasted grape vines, I got it primarily for decor, but as it turns out, they love to climb it. I've got the warm end heated with a 100 watt mercury vapor flood and a 100 watt spot. On the cool end I've got a 50 watt spot and ome of the Zoo med reptisun tubes. The high basking site on the warm end gets to about 120.
Chucks like tight retreats, I stacked two flat rocks on top of the clay pot to make the high basking site. Because of the shape of the rocks, there is a gap no more than half an inch. Next thing I know, one of my guys had stuffed themselves in. It's now, Rigel's favorite retreat. So with rocks, it's really important that they won't shift because the chucks are surprisingly strong (and determined) when they decide that there's a crack they want to squeeze in.
Chucks typically don't do well in open glass tanks, so if you go with a glass tank it's important to cover the back and sides. Since Gracie was having difficulty acclimating, I actually had all four sides covered. Now that I feel she's established, I'm taking about an inch off the front every other week or so. A lot of the handy people recomend building cages about 5 feet by 3 feet or building out door pens. I've read that 60 gallons is about the minimum size for a single chuck.
Here's a morning pic with Gracie on the rock and Rigel sandwiched underneath. I've also attached a pic of the central part of the tank, with the buffet
-Alice