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Tiger salamanders will dig and hide if they are kept way too cool, too warm, or too dry. I would suspect one of those issues. I don't know that salamanders are prone to 'constipation', and although you don't say what the original substrate was, coco fiber is a decent substrate for tiger salamanders.
Could you say more about husbandry in general -- tank size, furnishings, temperature, etc? That might help troubleshoot the issue.
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