hefner413
Active Member
Regarding the rock.. I actually only ended up moving one "base" rock to make room for the PVC. You can see above that the rock went in first initially. The 3 rocks that you see touching the sand on the left were not moved - they are still on the glass. The 4th one I did move, but I did a bit of twisting to make sure it was as deep as possible. The rest of the few on the right above the pvc are pretty much sitting on the pvc. The tonga rock isn't deep, but I'm not too worried about it. So, the rock on the left, bearing most of the structure is all on glass.