If you have two acan lords they can touch. But if you have a lord and a echinaca they will duke it out with the echinaca probably winning. They have a nasty sting.
+1, some sub-species can touch, but do not let them touch if they are not the same sub-species, really I just dont let any corals touch each other very much at all, as they are all waiting for a chance to eat each other.
