Unity3d keeping multiple gameobjects a mimimum distance between each other c#

I have multiple enemies that move toward the player. I am trying to stop them from merging into each other, i.e maintain some type of minimum distance between each other. What I'm trying is this (from unity3d forums):

 enemy1.transform.position = (enemy1.transform.position - enemy2.transform.position).normalized * distance + enemy2.transform.position;

However, when I have >= 3 enemies they still seem to bunch up even when I apply this to every enemy combination.

I need a better method as this one does not work and does not scale.