What they're selling as a "Blue" Hammer coral isn't blue at all, it just looks that way under the very blue light with actinic, it's possibly also photo shopped. Once you get it wouldn't look blue at all, save your money.
marrone is correct.
these are what many considered "blue" hammer. these are taken with the all the lights off. when the lights are on (2x400w 20k xm's and 2x 110w actinics vho's), they appear blue.
the "dead" heads are from my moorish idol, cbb, and flame angel....they seem to like the blue's more than the green's....may be the blue ones taste better....lol.