اَلسَّلَامُ عَلَيْكُمْ ustadh, I follow the opinion that fatiha should be recited behind the imam in loud rakat. During isha’, I forgot to recite it in the second rakat and after the imam concluded I stood up and offered another rakat. Did I do the right thing? If not, should I repeat salah?

Ustadh AbdulAziz al-Haqqan

Next time, don't stand up for one more raka'ah. As the prevailing saying goes, insha'Allah, tabaarak wa ta'ala, your prayer is valid and there is nothing on you as per the fatwa of Imam Ibn Baz.