Just my opinion. The marble gene is a curse that will ruin several good lines. It already has done just that. A year ago, i told several top breeders the marble gene would come back to haunt people. Nobody believed me, until breeders started noticing some so called pure lines had marble popping up, when no marble should be there. Since scores of people have been spawning to fish carrying the marble gene, it has gotten mixed in when it was not supposed to be there. yes, to some they are pretty fish. To someone who wants to raise a line with specific traits, having a good line suddenly produce the marble to fish that are being showed, it is a disaster. Several top breeders are now in the long difficult process of trying to remove the gene from their lines. It is the same with the melano gene. It is very hard to find steels that are not melano geno. I guess if people would only spawn marbles to marbles, it would be ok...but most do not. they mix the lines. I'm predicting within another year, there will be a widespread effort to remove the marble genes from many lines. Just my opinion.