The live rock had been curing in another tank and being collected slowley for about 18 months... I knew that I wanted at least one VERY large arch so I laid out cardboard and started selecting the right pieces... it took about 4-5 to make the initial upside down "J" "Skeleton" and this "J" wieghed right at 110lbs..Because of wieght I went ahead and placed this first arch. My sons helped me lower it in, it was all conected with Aqua stick a fiberglass based 2 part epoxy putty... and then I added about another 100lbs supporting rock onto the sides (to make it look natural and strong, fill in holes) around the base and at the top to connect into the other ongoing rockwork... I liked it all so much I went ahead and built another smaller arch on the other side of the tank also
