I've been wondering about this myself.
Phillip is constantly on the move. He's extremely happy in his 5 gallon, flaring now and then, building nests, eats well......I'm just wondering if he would be even happier in a 10 gallon with a few more friends than just Pookie the Catfish? Pookie seems extremely happy as well, he never hides and he seems to like Phillip.
I have hiding places and resting places but I never see them using those "beds".
Maybe I'm just using this as an excuse to get a second tank?