When I came back from Key Largo I couldn't find my male bluestripe pipefish.  After two weeks I figured my auto vacation brine shrimp hatchery and feeder is useless and  the pipefish starved and  was gone so I was going to buy another one.  Then along comes guess who?  Yes, he showed up all pregnant.  I am not sure where he was for those two weeks as they don't normally hide and he always comes out to eat.  He must have found a better hunting spot in the back of the tank because I have not seen him again in a couple of days.  I also have a leather coral that is so old I can't even imagine when I got it.  It is not looking to good and is kind of leaning over.  I am not concerned about this because this is normal coral wars and they come in cycles.  Something in the tank is exuding a substance that the leather coral does not like.  The other corals including the LPS and SPS seem very healthy and healthy corals hate other corals, especially corals of a different family.  When a coral dies and we don't know the cause we usually blame water parameters, temperature, Lady GaGa, Rap music, global warming, the hole in the Ozone layer or Al Gore.  I think it is a combination of all of those things including coral wars.  Having a coral war is kind of a good thing because only healthy corals can start a war.
It's like when we see algae.  Many people, especially Noobs will say OMG what can I add, how much water should I change, what type of snail should I put in or what is the best church to go to and what is the most potent prayer I can say to eliminate it.  Experienced aquarists realize algae is a good thing (in moderation) and grows on every healthy reef in the sea.  It probably grows on those under ice seas on the moons of Jupiter but I am speculation and would have to ask Al Gore.