Should I feed him again today or wait until next week? It's been almost two days since he ate. I thought it could be it, but I wasn't sure if it was okay to feed him again so soon if he is still digesting the other ones. I plan to get adult mice for next week and those should be the right size for him, right? I can try to offer him another hopper tomorrow, if you think that'd be better. I only used hoppers because the store was out of adult mice due to a shipment problem. I figured two hoppers would equal one adult mouse, but I was probably wrong. he did seem very interested in more afterwards, so maybe he is still hungry.

Also, thanks for the tip! I removed the ductape immediately. Not going to risk him getting hurt. Is there any tape or other method that would be good to secure the heat probe to the glass?