Well if your happy that red mites not a problem then that's fine just saying in most cases birds tapping there feet at night is because of red mites , and as a result of the mites biting they stamp there feet , the birds then don't rest properly and in severe cases become anaemic , red mites are rarely visible during the day they'll hide in cracks and dark places , I'm not saying you have or haven't got them , however i'd place a empty pickstone pot turned upside down where the foot tapper was and check in the morning for red mites . Lofts that are near chickens are at the greatest of risks , as red mite is mainly a poultry pest.