Our Pacs always....and I DO mean always........tear up, up-root & pretty much destroy any plants we place in their enclosures.
We have decided to just give them enough substrate to let them dig in to feel secure. The only time we have anything resembling stress now is when we are breeding and the lone males decide they are Australian and want to go Walk-About to get some nookie.
other than those times, they burrow in during the day and come out in the evening to get fed.
Good Luck!!