Hierarchy amongst corals

AL wrote:

I have a 120 G reef tank started about 1 year ago. I have noticed that
my small purple mushroom corals will kill off Acropora, some zooanthids
will kill off other hard corals, some button polyps will not damage the
same hard coral, yellow polyps seem mellow with everyone, etc. I am
dealing with this by trial and error and enjoying it. However--are
there any general rules? Has anyone sorted out a general hierarchy of
who bumps off whom in the battle for territory? Thanks for your
comments.



The rule have always heard is put at least 6 inches between individual
cnidarians.

But if you follow that rule, I guess you wouldn't be able to find out
who bothers who.