Yellow colour on live rock

lukefish

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Ive just noticed this yellow colour on the live rock. I’ve checked pictures from when I first got the rock and it wasn’t there before. Any idea what it is?

B652F703-10D5-4648-B3F4-0F090C35F59F.jpeg

The camera is enhancing the yellow colour

I’ve had the Fluval evo stock lights (full spectrum0 on for about 12 hours a day then for about 1 to 2 hours of the blue spectrum before bed time.
Maybe this is too much light?

thanks in advance
 

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