I am new to chickens, I grew a ton of striped sunflowers in my garden for them but I was reading that most people give their chickens the black sunflower seeds. From what I have gathered the striped ones aren't as nutritious and have a tougher shell. My question is am I right that they can still eat the striped ones? Also, all of my chickens are 12 weeks old, should I soak them or put them in a food processor before giving them to the chickens?