Ok, how often do these little guys come up for air? I've not had him that long ( surprised he survived the other days fiasco ) and haven't seen him come up for air very often...haven't seen him eat either for that matter...though, I haven't had as much time as I would like to have this week to sit and watch....just want to make sure he is happy in his new home! I also read they are happier with others in there as well..true?