Bumping this back up. I found this thread while searching for issues with Palmers Blue milli coloring up.
I got a couple frags from a prominent reefer in my area and they went from an amazing vibrant deep blue to a pale blue/white. I've tried everything from low in the tank to the very top, high, medium low flow etc etc and they just won't get any color back. I was using a Kessil A350 and now have my tank under a AI Sol Blue so maybe it's a spectrum issue? The only other coral that doesn't seem to like my tank is GARF purple bonsai. It is also on the pale side.
Otherwise I'm really happy with my other SPS pieces which include Oregon tort, Cali tort (thriving), SD Aqua rainbow milli, green milli, pink lemonade, raspberry lemonade etc.
No complaints with any of the above stuff in terms of color or PE at all. I run the Sols at 65% W, 70% B, 80% RB at peak. My nitrates and phosphates are undetectable. I run a skimmer and GFO/carbon reactor. I've been tempted to try cutting off the GFO just to see what happens but I'm afraid of an algae bloom.
I guess I could live with most of my SPS thriving but I sure miss that amazing color from my Palmers.