Quick question for reefers with experience with this(ok not so quick):
I have only done this one other time, usually when i set up a new tank, i am transferring everything from one tank to the new tank.
This time i have a running system in my fish room 60g frag tank, and a 40g sump. When i add my display tank online, i am basically going to fill the new display tank up with fresh salt water, and turn all pumps on, and it will basically be like a huge water change. My system will go from 100g to 380g with a flip of a switch. I will have my display filled up all the way to the top so that when I turn on the return pump for my display it will begin to let the fresh water drain into the overflow and then down into the sump. The sump is shared by both my running frag system and the display tank.
Finally my question is...would you expect to see much of a cycle? The rock i am using in the display tank is about 300-400lbs. of dried LR. It is all very clean rock, which you can see in my pictures. I will be transfering my LR that i currently have in my frag tank starting 24hours after the system is online. I know its bad to move all of your rocks around and that can cause a cycle, so i plan on doing that slowly piece by piece also.