In my experience, the fry spawned in a pairing between a pink convict and a standard convict come out looking like either standard convicts or pink convicts with a very small percentage looking like "marbled" convicts. Either way, people call them convicts. Because that's what they are.
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With the convict breeding you are referring to it should go be either 50% pink and 50% normal or all normal. The calico/marbled/paradox gene you are referring to is another gene all together. If neither parent shows the trait the you could have a max of 25% if both are heterozygous for the trait. Some normals have the trait it is just harder to notice with normal coloration. I have bred and raised hundreds of batches of convicts over the years with pure lines and both traits are true recessive traits on separate chromosomes so no linkage.
I think you are missing the point of what we are trying to say. Technically you are correct in that crossing any C. frontosa with any other would not be a hybrid, nor would crossing any C. gibernosa with any other, but front people don't see it that way. Front enthusiasts, as with many African cichlid enthusiasts, are in it for the beauty of the natural form, free from artificial selection of traits and obscure color variants. Each locale has its own nuances and are beautiful and unique because of these. Anything that strays from that is not generally favored by these type of people. I personally think black widows, reds, albinos, and piebalds are all interesting because of the genetics behind them, but I am a scientist and the genetic variation intrigues me.
You can breed them and find buyers for them, but it will likely be people that also get into the hybrid south and centrals or are relatively new to the hobby. The problem is that many of those types lose interest in fronts and never let them grow to their full potential. They grow far too slowly and display behaviors that are much less boisterous on average.
That is the reason that these variations have not caught on. Those of us who are willing to grow a fish from 1 inch to 8 inches in 3 years to produce a couple dozen fry per spawn at best are too busy with the natural populations to get into the designer types. And those who buy the designer types will likely trade them in or house them with something that will beat them up and cause their early demise.
If you want to take this on as a long term project I say go for it. It is going to take at least 5 years before you have any fry that display both red and widow genes, red being a simple recessive trait. This is unless you can get ahold of adults of each type and then maybe only 3 years. Good luck.
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