Could you post your paramter?
I'm kidding! People do it to me all the time (Me:"Params are on spot, don't ask"... people: "can you post your params?"... Me: "*&$%")
Are you running a low nutrient system? While I run close to that I personally believe that they make coral health very unstable as you are essentially starving them. This makes them pretty susceptable to pretty much anything and without the energy to fight it they collapse pretty quickly. RTN seems to be pretty common amoung ULN systems.
If you aren't running ULNS I'm going to guess chemical warfare maybe? What else do you have in the tank?
I had the same issue this summer, particularly my birdsnest. The birdsnest got the ol' dreaded white band at the base and I tried for months to fight it off but it was just teetering. Around this time I had frags and other colonies start to do the same thing. I finally caved in and fragged up the birdsnest and got rid of the dying areas. The instant I did that EVERYTHING perked up and all STN stopped and went away. Could there be one colony in your tank that is triggering it in all the others?
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