And then IMO, I would still add a piece of raw shrimp. If there is already bacteria in the system, it will need something to live on. If you are using any live rock from an established tank, it may have good bacteria in it. The raw shrimp will allow it to thrive and quite possibly avoid a heavy cycle. I think it would help in making sure a cycle starts if it is going to. And I dont think it would really hurt!
Just my experience, I started with live rock from an existing mature tank and fresh saltwater. I added a piece of shrimp and tested every other day for 2 months, with some coral, which came attached to the live rock, and a lot of snails and a few crabs in the tank and never had an ammonia spike.