just a thought, if he is only 12 weeks old and he is in a 4ft viv, then the size/space ratio could be wrong
get some plyboard or cardboard, cut to size of viv, this can be used to reduce the size of the viv, it can be moved as he grows.
For sale 0.1 VPI Pastel Royal
<---UPDATED - 24/07/15 -
SEE LIST ABOVE FOR ITEMS AND ANIMALS I HAVE FOR SALE.
<------ Got a snake that wont eat READ this first.