We have 12 chicks in the same brooder, a rubbermaid 35 gallon. They are 20 days old. I am going today to get two more containers to split them up. Is the overcrowding the reason we woke up this morning to find one with a bloody stump left of a (very small) tail???? Are they turning on each other? If I take them to an "expert" can they be sexed at this point? That way we can make the "cut" so to speak, which will lighten the load. We can only have 8 hens here in our town. I have 15 birds right now. I don't want them to hurt each other. They have been super healthy thus far......any words of wisdom?????