Well reds are just line bred Burundis with a genetic mutation. Why would purists not like a purebred fish?
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The combination of both the genetic mutation and the inbreeding which allowed for its prevalence is generally frowned upon. Line breeding and inbreeding are the exact same thing, only difference is context. Purists want fish as they are in the lake, which is why we go to so much trouble getting fish from a verifiable locale.
I personally don't have an issue with single species mutations as long as outcrossing is done to make the line strong. Albino, piebald, and whatever reds are (my suspicion is either hypomelanistic or tyrosinase positive albino) are all single gene mutations and do not require the cross of multiple species or locale morphs. That being said it is unlikely that what we refer to as Burundi fronts are pure anymore unless you get recent imports or progeny of such.
In the end get what you like and do your best to produce strong fry of that type. And most importantly be 100% honest when you sell your fry so everyone knows what they are getting.
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