Love your chicks! I had a BLRW chick who turned out to be a roo and I had to give him away because we are not allowed to have roos in my area. You won't be able to tell though until around 6 weeks. If you go to my page and scroll down you will see my roo there. I have several pics of him running around in the yard. You'll notice his saddle feathers going from his back and pointing down towards the ground. Also, his comb and waddles grew faster and turned red first. His head did not feather in as fast as the girls did, the girls are Silver Laced Wayandottes.
I hope this helps you.