Hey everyone! So I recently got a new turtle, she is quite big and I have a large tank with everything a turtle could want or need. I have 4 turtles, (2 juveniles and 2 adults.) The female has recently dug all the way to the tank and there's just nothing there. I was wondering if I could get some opinions or advice about why she may be doing it? Please note that I am putting grit in the bottom but as I went to do it I was unsure whether I should put it in that corner. They are Murray River turtles. Thanks, Ella.