Its probably still in that room so keep a towel under the door to prevent it from getting out if it hasn't already but I would be almost positive that its still in there just hiding. Every time I put my girl out in th open she just crawls for the first place she can hide possible. But may go on the move a night so try and find it now and again look in every nook and cranny around the tank first and move outward slowly and check everything from shoes to blankets and etc. Good luck.