Will 2 separate GSP frags play nicely together if on the same rock?

[RemoGaggi]

I went frag shopping today and ended with a 2nd green star polyp frag (dumb mistake on my part).  I already have a small GSP frag on a small rock (island) and wondering if I can just add this 2nd GSP frag to the same rock.  Will they grow into a single GSP or will they end up hurting each other?  Thanks.

 

[seabass]

Hmm... I'm not sure, good question.  I believe they will coexist.  GSP don't have much of a sting, their competition method seems to be to grow over their competition.