Nana reefer you might want to move your cans into just a little more light. They seem to be reaching for it a good bit. Maybe only 2 or three inches across the sand bed towards the light. I think that will help with color as well.
It's all good. So in a way I kind of agree that one of the acans colors maybe washed out. But my rainbow one is coloring up more since being moved to my tank from a 6 bulb t5. In that tank it showed 0 yellow in the center. Just for fun I'm going to drop lighting to 75% for a month or two. See what happens to the colors in them and all the SPS. I do have a couple Millis that just stay brown but figured it was just them getting acclimated.
The rainbow looks good. Don't go dropping intensity cuz of some guy on the net. Brown Millie probably aren't from too strong light, more likely the opposite. My millis always seem to like more light than any other corals.