6 cree LEDs over a small cube like that all running at 100% is more of a coral bleaching apparatus than a reef tank... I have 3 blue and 3 white XR-E crees over my 9" cube and run my whites at 33% and my royal blues at 50% and can do acros and clams down to the sandbed and have to start new additions down low around the edges even if they came from 250+ watt MH tanks.
I highly suggest either finding a way to dim them or keep them at least 8" off the water, it may only be a couple LEDs but its also only over a couple gallons.
Also don't worry about the lens, you can reattach with some clear silicone but one of mine has been missing for months now and I can't tell the difference in light spread or intensity.