I recently bought (1 wk ago) 3 baby chicks from a local feed store they were approx 1 day old when I got them. They were shipped here (CA) from a hatchery in MO. I have been feeding them a standard medicated (amprolium)starter food and keep the air temperature contolled with a brooder lamp. One of the chicks is not growing as fast as the others - she initially lost 2 grams in the first few days but now is gaining weight. She is otherwise bright, active and eating/drinking well. I occassionally see her pass very loose feces and also see loose feces with particles of undigested food in their cage and I am concerned that the diarrhea is not improving. I have seen 2 loose stools that are darker than the others - possibly due to blood? Should I consider diganostics or treatement trial of antibiotics? Or is this normal.