It is a little sharp to the touch if you apply preasure but considering the weight of a T I'm not sure if it would be a problem . How sensitive are a T's feet ? My plan is to carve out section so I can put in a clear water dish . God I hate that " DOG BOWL LOOK ". I am also planning on boring holes and filling them with potting soil for live plants , this way they can be watered without getting the rest of the tank wet . One other note feather rock may be the easest thing to grow moss on .