My only guess as to why more hasn't been done is that Congo is very subtle and seems to be hit or miss as to which genes it works so well with. I had hoped for good results when I first thought of pairing the Congo and Fire, and was very pleased with how the combination turned out. I personally really like the Mojave and Mystic genes, so I look forward to working this combination into those projects. As for the Congo gene being around for a while, you are correct. According to Ralph Davis' web page, it was first discovered by Vin Russo in 1999 (http://www.ralphdavisreptiles.com/ma...aits/congo.asp)