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Sorry but I don't see a single cornish rock on that page. Meat birds are usually too big to do any roosting. Even the last white bird pic looks like a leghorn to me. Edited to add pic: Here is a pic of my meat birds.

Are you sure they are Cornish Rocks? At 12 wks your birds should have already been large enough to butcher. You should be feeding them a 20% protein feed. Can you post a pic of your birds? If they are meat birds, you can keep a low wattage bulb on at night so they can eat 24/7. Good luck.