We've been feeding Layena crumbles and now have switched to Layena Pellets. Oyster shell is always available and the girls are all free range--outside with access to the entire yard all day until they are ready to roost. Eggs have been great but we've been having a heat wave. Not surprisingly the egg production is waaaaaaaaaaaaaay down, but the eggs from 2 of our girls are slightly sandy/ chalky and thin. Any suggestions or is this just something which happens?