have you added any new fish or inverts or other corals to the tank...if for some reason it's not a lighting problem, maybe you introduced something that is messing with them...but it's most likely a lighting problem
I would move them up in the tank at least 1/2 way from the bottom for a few weeks and see how they do there. I have been experimenting with placement in the tank and it makes all the difference in the world.
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