I'm glad you changed out the old UVB. I get my liquid calcium on ebay sometimes. Sometimes Tegus also drag their butt/vent on the floor to mark it. But if yours does it all the time than yes, it's because of the Calcium.
http://www.ebay.com/sch/i.html?_trks...at=0&_from=R40
This how my Tegu looked like when he marked the floor.
http://www.youtube.com/watch?v=FAvWWdxRl6o
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