I feed him 3 mice every 3-4 weeks.

Thanks for the water bottle advice! I really hate the fact that I haven't been able to change his water it is almost gone and looks dirty. =( I was given advice to put him in a plastic bin in a dark area to let him chill out and destress, so I might just do that while I change his water. I'm also going to clean out his tank because it needs to be cleaned and maybe that will help his mood?