There seems to be some effort towards breeding for brighter red and also for as little color as possible, at least by what the various breeders have to say over the years.
But really, the truth is, chasing genetic "morphs" with indigos isn't like doing the same with boas or ball pythons or most everything else commonly kept. Just getting normal, plain-jane indigos to reproduce is hit and miss. Fussing about a little more this or that tends to sit on the back burner with these guys and the focus is more on diversity than line breeding.
For me, the only thing I'd like to see bred for is size. I'd love a 10 foot eastern.
Doug T
>>I'm pretty new to indigos, so I have a question that may seem simple. Some of the eastern indigos have the dark indigo coloring with a deep red on the bottom, and some are solid colored. Is this a difference between indigos from different locations, or is this a genetic trait that can be bred for?