We had 80 chickens each with 8 square feet of indoor space. A few weeks ago they started vent pecking to the point of killing each other. I get 1-3 dead chickens a day. I am now down to 50ish chickens. I cannot keep going like this. I have tried the peepers but that only helped for about 2 days. They have roosts, nesting boxes, and I give them things like pumpkins and flock blocks to peck at. I have raised chickens for 15 years and never seen anything like this. Any ideas?