My lights were recently changed, probably w/in the last two months. The water that I use is purchased RO/DI water. I'm sure that the TDS is low because I haven't had any algea outbreaks. I do ocassionally add cyclo-eeze to the tank but that is it except for the frozen brine. The problem started prior to adding the Anthelia. Do you think that a large LTA could be emitting toxin into the water? He really isn't close to anything. Maybe I have some chemical warefare. Is there anyhting I can do for this except water changes? Or is this even a viable question? Any other thoughts???