I have a couple of box turtles, one of which is quickly outgrowing his current enclosure. So right now I'm looking into what route I want to go. I'm thinking maybe the bookcase thing, though I think large plastic tubs would be better with the high humidity requirements of a gulf coast box turtle. For right now, one 55 gallon rubbermaid tote would be large enough for him as he is only 1.5 years old. But in a couple of years I would need to upgrade yet again. I have seen people talk about using two plastic tubs and connecting them somehow?? Can someone explain this to me, or even show me pics if they have done it?