Hi! I have a forty gallon tank for my bearded dragon I was hoping to have tile substrate for. However, I am having a lot of trouble finding unglazed tile that isn’t way too smooth for him to walk on. I tried Home Depot and searching online and I’m not having the best of luck. Does anyone have links of suggestions for certain shops to find more rough and unglazed 18”18” tile he wouldn’t be slipping and sliding on?