When I setup my 180, I used 180lbs of new sand and some LS
from my previous tank and a friends tank. I put some of my excess LR
in the sump and that was it. A month later I added my LR
from my 75 and my corals and fish. I did not cycle and did not see any hint of one. I had some anthelia in the 180 to gauge any water issues. That stuff never missed a beat. Did not have light either except the room lights.
You could add some ammonia to see if anything happens but I think the shrimp might not be needed since your not starting brand new ...
If you have enough LR
in there, you won't have a cycle.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,