I was cleaning the cube today & moved one of the rocks & found this at the bottom. I thought at first it was that putty to hold the frags in places. Ive been taking pieces of that putty out since there was plenty falling off the rocks. I'm new to SW so I was thrown into it by a friend who needed it out of the house, but so far everything has been good knock on my wood; Growing very nice & healthy. So anyways...
What is it?
What is it?