One thing to consider here with Disco, Vanilla, or any of the other alleles in the BlkEL group since you have expressed some concern about being able to ID Fire... I have heard many, many stories about people breeding out their Vanilla/Fire or Disco/Fire and not being able to tell which babies are which morph. It is enough of a detraction for me that I have chosen to only work with the Fire allele and save myself potential headaches