Release that snake. It is currently too small to be a threat even to hatchlings. Adult snakes more problematic but losses when they occur are usually light. I have lost very few chickens to snakes but have lost lots songbirds, rabbits and fish to them. Chicks should be easy to protect by keeping vulnerable birds up and in a box snake can not crawl into. You could also rent my dogs as they kill and eat snakes of all flavors.