|Now the waiting starts:) The most exciting part of making these rocks is digging them up. Be certain to give them time to set up, and don't be like me or you will break too many.
We let the boxes set up by stacking eack fish box on top of the one before. I am certain that by moving them carefully they are vibrated just enough for the gravel to stick to the cave rock. You will notice that the rocks heat up as they cure. The fish boxes help hold the heat.
You will want to keep the boxes covered if you have cats:)