Hard to tell with the pics being different, but it looks thinner in the second, and perhaps more zooxanthalae making it appear browner. Have you checked PO4? Are you using anything to remove phosphate? Any other corals browning out, or impeded growth? Maybe slow down on the feeding and make sure it gets as much light as you can give it.
As an FYI, I feed my LPS maybe twice a year, if I remember. I'm not sure what regular feeding might do to internal algae content..perhaps others might confirm/deny my thoughts on that.
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Brad
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