Acropora spacing

How much space do acropora frags have to be placed? I have two growing into each other with one stinging and killing the other?
 
I don’t think there’s a golden rule. I know most will just frag them away from each other or just let them battle it out. However, being frags, I’d give a little more space that way they can become colonies before having to fight it out
 
Some grow much faster than others. My PC Rainbow and BC Kermit have taken forever to grow. Whereas my BC Frankie's Kryptonite and UC Strawberry Shortcake grow pretty fast. It's always good to give some room to grow and for clearance to the glass for maintenance.
 
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