I got another Sulcata over the weekend. It is 10 years old or so (from the previous owner's account) When I picked her up, I noticed that the plastron seemed to move in and out when I moved my fingers. It isn't as hard as the others, is this a cause for concern? She has pyramiding pretty bad and was kept in a fish aquarium and could only move forward and backwards. Bummer deal, but she is out with the rest now and moving and grooving. Just curious about the flexible plastron. I would assume she had little to no calcium, so will start introducing it to her.