We bought three bags of this sand for my son's hermit crabs. After replacing the previous substrate with this sand, our three hermit crabs were visibly excited. All three started eating sand, digging in it, and all got even bigger shells. Before filling this sand, the crabs stayed buried all the time and only emerged at night. Now they seem much more active and happier. This sand must contain the minerals they need. We love it and will buy it again.
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