Big thanks to Poppa for all the info.
Finally got in contact with a fellow keeper/breeder(not of ramirezi he keeps saying) from Germany who indeed confirmed Andy and Poppa almost to the word;"very rare"!
He mentions;
I had ramirezi not bred. But I had to take pictures with breeders from our former club, if they wanted to make a presentation. I liked the fish always. But I had the water too small. It was the ancestral form,
cacatuoides.
There are still among the offspring more yellow? And you have yellow couples recognized for breeding?
It may be a mutation. But that's very rare.
It must eventually had trunk with color variations connection with
parents. Today there are all colors, blue, orange, red. The lemon yellow I have not yet seen.
If it is dominant, the yellow color is back. If recessive, so it is covered by the normal color. (The phenotype). But in the genotype the property exists, and may occur by chance again.
These genetics is complicated. And practice this takes a lot of time and patience
I have pulled the yellow parents as of yesterday(caught by hand in my hand!) and as usual the fry have scattered and are very difficult to see?
I still see some(few) and am feeding the 1/2 filled 29g at least 2X daily.
On the bright side(Bright yellow!!) the pair look to be ready to spawn again in their now new 1/2 filled 20G!!!!!
CLOCKWORK hopefully,as I have seen this before!!