SELECT MIN(season) FROM table_name_43 WHERE households_viewers__in_millions_ < 25.4 AND viewer_rank___number_ = "#6"
Musim mana yang memiliki kurang dari 25,4 pemirsa dan memiliki peringkat pemirsa #6?
CREATE TABLE table_name_43 (season INTEGER, households_viewers__in_millions_ VARCHAR, viewer_rank___number_ VARCHAR)