I just put up a 29 gallon tank 30"18"12" and cree XPG led 9 white 12 blue. Somehow none of my coral showing any sign of life and even the hardy mushroom like it use to. Im not using the lens on the led, and place the coral and mushrooms 12" to 6" from the light with glass cover in between, the light about 4" apart white/blue mix. Can some one tell me what i did wrong.