Scott Howard
I keep crushed coral, some gravel, as well as larger rocks and drift wood in my systems. They need a natural way to keep their beaks worn and to supplement calcium. The gravel bed will maintain “cleaner” water if cared for properly or it could house nasty pathenogens if not maintained. White “knees” are a typical characteristic of a stress turtle that has been trying to escape from its enclosure just to rub its legs raw. Scott — In diamondbackterrapins@egroups.com, greentrees