Rmanno, you can easily have 2

One may get too lonely

We all need friends, right?
Gamer, read this again:
Angelfish
raised together with other fish like Neon Tetras or Zebra Danios, may just ignore them, even if they're still small/babies. But Angels raised with other Angels only, may certainly try to eat other smaller fish right away. They'll think the smaller fish are food.
To give you an example: I bought my 2 Angelfish when they were still small, and I raised them with 12 Neon Tetras. When my Angels grew up, they didn't bother my Neon Tetras because they were raised together with them.