Not to burst your bubble............but I had two different ones get loose. The first was found 1 1/2 days later underneath the tank in a box of nintendo games. The second went for 1 1/2 weeks (with me looking every day and night) until I found him by the front door with two cats checking him out. Tried to feed him that night and he wouldn't eat, put him back in the cage and found him the next day.....passed. Guess it was probably a combination of stress, dehydration and probably not enough heat. Sorry again to tell you this, but just goes to show the importance of how easy they can escape and that you always have to know if other people are going to be in the room with them while you are not. Good luck, it is still early enough to find him. Follow the other peeps advice, start close to the tank and work outwards.