Hey Marko are those the shrimp you got from me? If so, the young females are spotty and will get closer to a solid red like the others as they get older. The males will stay clear with red strips they aren't as colorful but a necessary evil
for a breeding colony and they will never turn red.
If you haven't already done so I would also pick up a food high in calcium which is what I'd treat mine to a few times a week.
This is what I use.
Cube looks good!