:salam2:
You have to read Surrah Faatih in every rakah.
Prophet Muhammad :saw: said in sahih Bukhari and in Sahih Muslim.
who do not read surrah Faatih in Salah, his .her Sallat is not acceptable.
so it is Farad to read Surrah Faatih in every Rakah.
Jazakallah
:wasalam: