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Chin, approximately how far is your tort from your lights? And of course, what ballast and bulb(s) are you using?
What do you feed your tank?
I'm experiencing the same thing as unsped with my tort, and suspect it's actually a form of bleaching. It's a very slow process that doesn't seem to kill the coral, but seems to keep it from thriving. This can go on for many months.
I've got tons of light (2x250w Giesemann 14.5k), flow (Stream pumps), excellent CA/dKH, etc. Sometimes I'm tempted to put my lights up much higher to see if it makes a positive difference in coral coloring.
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