Kickstarting this post again. I just measured my snake, and he's around 4.5' long. I didn't expect him to be that long, I was way understimating. It was a rough measurement as I tried to run a cord along him and then measure the cord, but even if I was off by 6", that's still pretty big. I did the math, and he's at least 5 years old, so he's a full adult. So revisiting my tank size question, is 40 gal still a good size, or should I go up?