I saw it and had to have it.
The guy at Nippon (this was a while ago) said, "You will never see it, they hide all the time."
I watch my tank carefully. He was wrong. I saw it three times in five years. for all I know it's still in the tank but I have not seen it for about two years.
My cryptic six line comes out all the time, it might have to do with tank size and tankmates though. I have a blenny and a pair of clowns as a tank mates.