I had two bantam Silkie day-olds raised with 4 large fowl day-olds. The LFs grew larger and faster than the bantam Silkies and the larger chicks started to pick on the smaller bantams. The Silkies would have to hide behind feeders and waterers to keep from getting pecked. It makes for very shy thwarted bantam personalities to be harassed by LF chickmates. Watch your brooder dynamics and at the first sign of pecking on the bantams I would remove them to their own brooder. Growing up together doesn't mean LFs and bantams will be buddies. Red and Black sexlinks are assertive birds. Your Amer-I-canas are Easter Eggers if they are from TSC. Easter Eggers (EEs) are usually non-combative but can take advantage of smaller chicks just because they can - it's a chicken thing! FYI - True Amer-AU-cana breeders get miffed at newbies calling Easter Eggers as Amer-I-canas because that is the way hatcheries/feed stores sell them and it is incorrect - not to mention the bad spelling. Feed store "Amer-I-canas" are truly called Easter Eggers. They will give blue, green-blue, green, sage, mint, stone, pink, even white eggs. Fun to see what color a pullet will finally lay. GL w/your new babies!