i have a colony of ponape birds nest that is situated mid range in my tank and isnt holding its color very well. it used to be bright yellow and pink, but since then the yellow has faded and so has the pink. coral still has full polyp extension and seems to still be growing but isnt reaching its desired color. i have been told before to keep it lower in the tank or else it will bleach but it seems like that only makes it worse. also i dont want to put it to high as to kill it. i am running a full spectrum 6 bulb t5 light in a 65 gallon. i would apreciate the advice