You are welcome. Specifically what you are seeing is Red bleeding though the black not brown. They look like healthy happy chicks aside from that. Best wishes.
Absolutely NOT normal. This would be a huge disqualifying fault. They should also have nearly black shanks and toes. Yours have too much willow. Also they should have Dark Brown eyes so you are WAAAAAAAAAY outside the standard of perfection.
Flock integration can be tricky. Your ratio of Roosters to Hens should be about 1:10 It sounds like your ratio is 1:3 which is not nearly enough hens for 2 roosters to share. This is likely to cause your birds a lot of stress IMO. How you want to deal with integration is your decision but I...
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That is stll very young. They need to imprint on the coop, you can help them by putting them in there once it starts getting dark. They will get the hang of it pretty soon. Best wishes!