mine do best in the sand under a 250w mh, under the 120w led it washes allot of color. most of my chalices change or loose a ton of color under the led's
I put it in the shade for about three months. During this time it did not grow at all it just recouped. Recently the two eyes have gotten bigger and it has grown down the side of the plug.
Do a dip in coralRX and then put it in the shade and leave it for a while. It may help.
Here is mine. It is super bright under Mazarra LEDs and I just have it sitting on the sand bed. Tank is a normal 24" deep. Only four eyes on a big frag plug, but I don't target feed it at all.