Ah, I found it. I got my HW finished fast so I had time to look. The color is Black orchid.
Black Orchid: This name was first coined by Henry Yin of Indonesia to describe his unique strain of prizewinning crowntails. These fish were black with heavy steel blue iridescence running through the rays of the fins. It is a very beautiful type, and fairly rare. Unfortunately they are difficult to show, as the IBC considers the iridescence a fault in the black class, yet the fact the fins aren't an entirely different color from the body make it unserviceable in the dark bicolor class as well.

Wow, I didn't know they were rare. No wonder I've only seen them twice. Maybe I should have bought them even though they were a mix rare. Once I saw wasn't that bad. His tail was mostly DR but had 2 single rays.
Picu and info from:
http://bettysplendens.comI love the black orchid. super and melano black do nothing for me. I love the turquoise on these guys.