My torch refuses to coexist with anything, it is very sticky and even the fish and shrimp go out of their way to avoid it

Huh, mine is the picture of friendlyness. I've never seen the sweepers on it, it is very close to a Candy Cane and a Favia. It's never touched them. Neither the Candy Cane or the Favia send out sweepers either.


To answer your question, mine does just fine under PC's

I did too - because they're of the same family - obviously not!

OTOH, it's left my ricordia alone, but continues to beat up my favia which is unfortunately in a precarious position right now :(