Ive been using Coco for nearly two years never noticed a film/mould on it. I have however found a rusty nail and a piece of glass in it so make sure you filter through it with your hands to make sure your tortoise doesnt find anything it my try and eat, i think i got a bad batch as it both bits i found had been in same block but because i have mixed two brands i wasnt sure who to write a complaint letter to.
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