Reef Scaping Advice Needed

[Wayne]

Well I am tired of having a mountain of rock thats kinda tippy in some areas. I want to have my rock stacked up higher with more caves and passage ways for my fish.

I have heard of people using 1/2" pcv pipe and masonary bits to drill the rock and stack it but I was wondering how far you drill into the rock? Do you use glues? If so is there something better than that putty epoxy?

Also any tips or tricks would be awsome aswell as pictures