It's a strain developed by Pete Mang. I'm assuming you see them listed on aquabid, in which his username is Lotsoffish. This strain is known for their vivid blue and green coloration and more importantly their metallic shine. Pete has crossed them with other lines, and they all seem to look amazing. He also has Nebula Steel blues or something like that. They are similar. I've debated on getting some but since they have become so popular, his auctions have been getting bid quite high. It's great news for him, just tough for us to get them. IMO however, they are stunning fish to have