LPS Questions, fading ridges.....

[Lowefx]

My Platygyra has been doing great, slow grower, but nice green and pink mouths. Lately I've noticed the ridges are fading from the dark purple to white. As you can see the shaded area has no ill effect. I have not moved this guy in almost 1 year. It's mid to low in my 120g tank (4x2x2), with 2x 150 mh 14k ,and 4x t5 48". I feed it maybe once a week with mysis. Feeder tentacles don't usually come out for a while dusting feeding time. Fish usually get to it first.
Any insight will help out.

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[AlSimmons]

I'm not really seeing anything out of the ordinary from the picture above, although new growth in sps corals usually starts off white so maybe that's what's going on here.

 

[Lowefx]

Here's some better pictures....

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[Pond Boy]

I dunno look's pretty healthy to my eyes...

 

[taricha]

LPS Questions, fading ridges.....

It looks like there's a shaft of bright light in those last pics. You don't think it's related?

 

[Lakejoery]

I looks fine to me, better then lots of them Ive seen. Any major changes in the tank? Like fluctuations?