What I am about to say is strictly due to experience, not opinion. Tanks do make for a much more atractive display, but they have few benefits for a young snake. A small jungle, or any type of carpet for that matter, feels much more secure in a small rubbermaid than a tank. A 15 gallon tank will be more than enough room for the snake, but they don't hold humidity or heat very well unless you partially cover the top. Also, the snake may feel insecure having so much space, and I have had them go off feed for months until I return them to a small rubbermaid, whereas they ALWAYS return to eating properly. I have used both methods, but I'm just trying to let you know what to look out for. The little fella may be overwhelmed by the 15 gallon tank, especially if the source you're recieving it from has used rubbermaids. Just keep the smaller rubbermaid in the back of your mind cause you might need it