I usually buy cypress mulch from Home Depot for the substrate in my red foot tortoise tank . This time, they only had a cypress mulch "blend." I tried to look for ingredients, and it only said cypress mulch and other natural wood. I put it in his tank, and he dug a hole and buried himself in it. But his eyes look like they might be watering. Has anyone use the cypress mulch blend? And does it have bad stuff in it? Also, what should I look for to tell if the substrate is causing him problems? Thanks for any help!