Just top soil on its own is the best substrate for torts, it will hold the moisture better than coco fibre. I've kept tortoises for 45 years and I've never known one to fill its self up with soil, as sandy has said I'm sure he will stop, they would much rather eat weeds and flowers.
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Suze. 
3 THB, Sammy, Jemima, & Phoebe
7 Marginated, Tabitha, Ptolome, Tatiana, Noah,Lottey, Lulu & Poppy
1 TGG (Emma) RIP Feb 2012
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