Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
The eggcrate/lighting product is a good way to go.
For smaller rocks (if I can place them with one hand) I just cushion with substrate. But if I have to use 2 hands to control the rock, some sort of protection is a very good idea. All that weight sitting on just a few points on the glass does not seem safe.