Suwanee Ga?
That is where I live! Hello neighbor....
As for you question...
The only glue that I use is super glue for fragging out corals...You can't glue your rocks together really..You can use putty that you can order of the net...It must be marine putty!
I was going to do that with my tank but changed my mind...Once you putty it, forget ever changing your aquascaping. I stacked mine on top of each other...If you find the right groves it won't budge! I have never had anything fall over, well I take that back I have a few
tonga branch pieces that my large snails can nock over.
You can also drill holes in it and tie it together with wire ties...You can even mount all of that to pvc...That is the best way really...Nothing falls and is very sturdy....Plus you can make some really cool formations.....
What size is your tank and how much rock do you have?
Clay