An Imam forgot to recite Surah al-Fatihah. He began his Salah (prayer) by reciting a short Surah. Ma'mums (persons being led by an Imam in Prayer) drew his attention to this matter. Therefore, he recited Surah Al-Fatihah and completed his Salah. Then, he performed Sujud-ul-Sahw (Prostration of Forgetfulness). Should he re-perform his Salah again?
If what happened is as what has been mentioned, then he is not required to perform his Salah again. He is also not required to perform Sujud-ul-Sahw. But if he did, then his Salah still correct and valid.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.