I've had turtles before and I can't imagine using nasty carpet. There's just no way you could keep it clean or mould free with all the wetness and their waste products and so forth....ick! I'd toss that fast.

Post whatever you need hon for advice from our resident turtle experts. You may want to try a very gentle, friendly approach upfront but have all the information at hand. Also whatever you can do now to ease this turtle's life, you're doing a wonderful thing! Good for you for stepping up for this animal.