yeah, snakes will explore the tank if they're new. that's nothing bad. that is a perfectly fine tank size, as long as the hides are not too big it shouldn't be a problem. also, if there is a smell in the air that is new, they'll try to get a better "sniff" of it to see what's going on. my snake does that when i come home, kind of like a dog sniffing you to see where you've been.