Currently my rats have a cage by Super Pet...the 2 level Habitat Defined. I'm thinking of moving them into a cage from Martin's Cages...but one thing: I'm worried about the fact his are all wire! Won't that hurt their little paws? All of my guys have their ramps, shelves, etc in smooth plastic at the moment. I know they will probably start to chew it, though, so I know a new cage is best. Will the galvanized wire mesh hurt their feet since they have been on plastic? I'm just being a worried mama who needs some help!