I have 10 pullets, about 4 weeks old. 4 Rhode Island Reds, 4 Buff Orpingtons, and 2 Black Sex Links. One of the Rhode Islands has started chasing the others around and pecking at them. I have them in a 100 gallon galvanized water tank - it's 4 feet long by 2 feet wide by 2 feet high. According to Storey's, floor space requirements for chicks 0-10 weeks are 0.8-1.0 sq. ft. per bird, so I should have enough space. They are fed Purina Start and Grow, non-medicated. Fresh water is given daily. The bully doesn't seem to be injuring the others, though the victims do squawk loudly. What should I do? Should I be giving them treats like I've read about in the forum here (I didn't know that was possible at this age)? What should I give them? Thanks!