Help Needed!! Sakura not showing colours!

[Aquarubies]

I have a 1.5 feet sakura tank. Using eheim pickup 2008 as filtration with ceramic rings inserted, have aquarium cooling fan and sera blue sky royal as lighting. However, about 90% of my sakura offsprings are not having colouration. Some of them even appear transparent like snowballs. They do not appear stressed as they are healthly moulting to big size adults, reproducing and are not dying off too. The parents are in full red as they are bought from a reowned seller here 6 months ago. So I think they are not due to bad genes. Can anybody help me out here?

[Shadow]

probably they are still too young. normally the juvenile have little color

[Aquarubies]

NO...but when they are adults, they still appear transparent. The females that have berried are orangey.. no signs of improvement when they are adults.