Rach

Hi there, I’m very new to being a mum to two reeves turtles and no vets or experts here in my area. I’m also wondering if the barrel in my turtle tank is harming my turtles shell as it rubs itself all the time and it’s quite rough. I’ve notice lighter almost white marks on one side of shell and also lighter brown colour around the edge of shell. Is this something to be concerned about? Thanks!