Hi there.. I'm a brand new bunny caretaker. I opted to go with a NIC cage and now I have one question. I put in a shelf and am making a half shelf to help my rabbit get to the first shelf as he has yet to try it out. Both shelves are somewhat textured so his feet won't slip but the bottom of his cage is just smooth vinyl flooring. I don't want him to slip as he hops down so what is a good solution for this?