I have him in my dorm at school, in a heated and filtered 1g tank. I know that it isnt completely ideal, but it's about the best I can do in my dorm. There is just a robot, which you can see in the background and that I made sure was filed down before Ralph went in the tank.
There is also a plastic plant that seems pretty soft, but I may consider replacing it with a live plant if I can get a good recommendation for one.
I do a complete water change about every 3 weeks, I have been trying to figure out what is a good routine for that.
Don't be too harsh, I know these aren't completely ideal conditions, I just wanted a friend in my dorm room, but I try to keep him heated and comfortable.
Tips are appreciated.