Volcanic Rock VS Stones?


Hey guys I just bought a veiled yesterday, as previously posted. I am going to buy a tree for her to free range in at the house. My question is .. If I put larger volcanic rock at the base of the tree so she doesn't get into dirt or w/e instead of regular stones .. is that acceptable? There big enough but a little rough (kinda like the waterproof vine I bought).. but are they dangerous? harmful at all to chams?
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