Coral warfare

[JACKS REEF]

Hey i just have a question. Will these two corals fight. I dont know the exact species, i was just wondering if they will fight and what i should do to help prevent this issue.

 

[Reefer Matt]

They look like pavona to me. But I could be wrong. If they are both the same species, then they may not sting each other, per se. But one may grow over the other. I would be more concerned about them growing over the weir on the overflow box, and causing a backup.