ANSWER:

Reciting another surah after fateha is a sunnah so if you recite it, you would be rewarded and if you don’t then also no problem and your prayer would still be valid. 

Sheikh people told me different views about the salah that in the 3rd and 4th rakah we should only recite fatiha while some say we recite a surah after fatiha

Prayer | November 6, 2018 7:21 am
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What if I reached the masjid after the first row is full! Can I pray alone in row 2 with imam or can I pull someone from the middle of first row and then we both pray in the second row? In the second case how to fill the gap in first row? Please answer!