My two hens have had a long battle with diseases. After several months of medications, not eating, and losing weight, it seemed like they were on the road to recovery. A few months ago I built them a new coop and put sand down for flooring. Over the past week I have noticed their weight has dropped. Then I cleaned out the coop a couple days ago and noticed voluminous poos. With gloved hands, I inspected the poo and it was mostly sand. I have also noticed that they are not eating as much of their regular food as they previously did. They have granite grit and crushed oyster shell grit available all the time. I am worried because they are still underweight and are now eating sand. Not sure if this is pertinent, but they are also going through a molt; one worse than the other. The one with the really bad molt seems to be losing the most weight. I give them tons of protein during the molt. I really think they are just eating sand instead of food. How do I stop this without having to remove all of the sand from their coop? Another note, I have been working later than usual and they haven't been able to get outside as much as before and I wonder if that is why they have been eating sand. Any clues as to why my Ladies are mental sand-eaters?