5 or 6 heckel discus?

[Daubentonia]

Hello! So I have a 60gallon lightly planted tank with a school of 8 rummy nose and a school of 8 cardinals. My LFS has some wild heckel discus in-stock and I was thinking about getting those, I was wondering if I could keep 5 or 6 discus in this tank?
Thanks in advance!