While my rats were having floor time yesterday afternoon, one of them, Harriet, got behind the water tank, which is fixed to the floor and wall and is immobile, and I cannot get her to come out. I heard her yesterday chewing the paper from the insulation, but this morning I do not hear her. I'm worried as to her well being, not only because she's back there, but also because I have to go out of the house today and we have a cat. The cat has never tried to hurt any of the rats before, but there is a first time for everything, right? So any suggestions on how to get her to come out? Moving the hot water tank is not an option!