Aquascaping

I have read that you can glue base rock together to make pillars and caves. What would you use to make them hold well. Also, does anyone have a link to a thread on aquascaping?
 
You can always put PVC pipe in them if the rocks are large enough. I'm going to drill holes in my rocks and then put pvc pipe in it so they all stay together and won't fall. I've seen it before and it looks pretty neat. Never tried glue so don't know what type to use.
 
I have not used epoxies or glue. I have just made sure that I stacked the rock well. Being careful in rock selection has been important at least for me. You can also use the back glass for stability if needed.
 
I just stacked mine. I thought about some sort of glue...but I think as long as you stack them well with enough support they should be fine.
 
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