Information on my system. I have a 30 x 30 x 20h cube with 5 x Evil's PAR 38 bulbs on it (ie a combo of 25 Cree's). The Cree's have 40 degree optics and are around 12 to 14 inches off the top of the water. I've been running this set up on my mixed BTA tank (20 total) for 7 months now. I feed the nems once or twice a week and they're growing in size, but it appears to me that their colors are so muted now. I wish I would have taken before and after pictures of some of them, but for sure I've seen color loss. Some of the colors used to "pop!" once they had been put in the LED tank, now they don't pop at all. I feed a mixture of mysis, coral frenzy, and formula 1 frozen food to the nems. My parameters are stable (easy to do in a full nem tank that doesn't use up calcium etc), except my nitrates run around 20 I think from the heavy feeding. Nitrates are the same on this tank as on the previous tank prior to LED's. The only difference is, I only do a water change every 3 to 4 months now because I'm running biopellets. I also run carbon in a reactor that is changed out once a month. Any advice or comments? I'm thinking about switching back to MH's. Let me know what you think.