Hello. I have a spot of live rock that I would like to add a coral with some movement, like a torch. I've read that torches sting nearby corals. The only thing somewhat near the sides of this spot is a purple Pavona, however, below this spot the live rock is encrusted with a couple types of leptoseris and psammocora. If the polyps of a torch "swing" downward and brushes the encrusting corals, will it kill them? Having never had a torch I'm not sure how strong the sting is. Thanks.
