Birdsnest Question

I have an ORA Green Birdsnest, a Ponope Birdsnest and a Purple polyp birdsnest. My question is can I place them all on the same rock or will they eventually sting each other is it ok, or bad idea?
 
I have ponape, ora green, and birds of paradise close to each other on my birdsnest rock and they just grow around each other. no problem. the green grows super fast though.
 
Not to hijack the thread, does anyone's pink BN's branches fuse together making an intricate network? Mine does.
 
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