Zebra Fish and Black Guppy

Zebra Fish and Black Guppy
I have reason to believe there is unhealthy practices of Fish Breeding.
I may have briefly mentioned this sometime in the past. 

I cannot trace the piece of writing.
In any case there seems to be new developments.
There is a guy who breeds albino zebras.
He has now introduced a pink strain.
I have an obsession on the topic of pigmentation, especially in regard to Guppy fish.
 

I wished as a kid, I could see a Guppy black like a black molly.
A guy in Thibirigasya, actually accomplished it.
 

He deserves a Nobel Prize.
 

I do not know how he accomplished it but to see a Guppy with band of black is common now.
These Guppies are robust, healthy and of reasonable size.
 

But all the variants of Zebras were tiny.
 

They do not grow to adult size in spite of proper feeding.
They do not mix in the shoal with normally colored zebras.
In other words they were unhealthy.