OK, some help here please. We have a 17 week old EE (Bella) whos started to lay last week. She started laying on chic crumble (shells very thin), I quickly switched it to layer feed with oyster shells. She (and all) have access to free eat oyster shells in addition to the feed. They have had this for about a week now, but Bellas eggs are still very thin on shells, and todays egg (shes been laying one daily) was shell-less. Ive seen her eating the oyster shells but dont know what else to do How long will it take for her calcium to build up enough so that she has shelled eggs? Is there something that I can do in addition to help up her calcium? Do chickens eat tums? Ideas and help greatly appreciated. Thanks, Pic of Bella and her second egg (shell was soft).