Welcome redlink,
So glad you joined the BYC coop! One thing about red sexlinks, they are aggressive to any new colored birds. My reds went after my goldens with a vengeance. And that's after a whole summer of free ranging together. So that they could see and hear each other, but get away from them when needed. If you get chicks, just be sure that they are about the same size when you start introduce them. CDs in the run help distract the older hens away from the new. Also I used sticks to block of a section of the run. So the new girls can get away from them. Most importantly, have multiple food and water stations so the new hens can get food and water until the new pecking order is established. For me the pecking order fights was the hardest part. Check over the new girls regularly and doctor any bad wounds. Chickens love blood! Once they draw it, things could get deadly. Good luck!