Tonight I replaced the stock AquaticLife 10k bulbs with the new ATI Aquablue Specials to go along with the Blue+ bulbs I installed last month. First I should note that prior to the bulb change, the tank looked more blue tonight than it ever has before. I attribute this to the addition of the carbon and GFO last night that has removed the slight yellow tinge from the water. Now that the 10k AquaticLife bulbs are gone and the Aquablue Specials are in, the tank appears a tad more purple than before to my eye. I am not sure If I like it... it may take a bit to get used to. I am curious if my wife will notice the change when she gets home.