Tried 3 sizes: pinky, fuzzy, hopper. Not even a little bit interested, he almost looked like he was trying to hide from it. I set one on top of the log in the warm part of the tank where he likes to hang out and left for a couple hours, when I got back the mouse was gone and I started rejoicing- but he had just pushed it off so he could sit there. I found it behind the log upon further inspection. The fuzzy was the only live size I tried. I got it from the pet store I got him from, he was raised on their pinkies.
I wouldnt have the heart to brain a live mouse, ew... it's freshly killed. The same fuzzy that i tried live.