albino longfin fry - some have long fins and some short like a common albino size.

[pointpleco]

My longfins are breeding nicely, but i get a few in each batch (about 25%) that don't seem to be longfins. They look like a common albino, well so far anyway. Is this just the genes of the parents, not being 100% longfin themselves. If so that means the fry may also be like that when they are old enough to breed??
If i sold them would i just have to tell people they are from longfin parents and have the longfin gene.

Thanks