So, I recently gotten a male pet mouse, and I left him alone for 3 days, before I started to try and tame him. He is able to take food from my hand, and is willing to sniff my hand, however, he has been biting me whenever my hand is nearby. If I'm cleaning the cage for example, he will bite a lot until I move my hand away. I know its not mouse biting as in him trying to find out if I'm food or not, because I felt those bites initially, and it wasn't painful, as in, it almost caused me to bleed. I'm wondering if there is anything I can do to stop him from biting, as I don't want to return him where I got him, since he gotten a lot of bite marks from the other mice he was with before.