I forgot to mention. These 52's are unique because the are the European edition colors. They are less pink and more blue like the folks at DD The Aquarium Solution (European AI distributor) prefer: http://www.theaquariumsolution.com/a...wo%E2%84%A2-eu The short version: These have 12 Blue rather than 12 Royal blue. They result is more of a Sol Blue color, rather than the normal 52 pinkish undertone.