@randym interesting. I have talked with others about C-Sky/Sea Sky Blue Neos. Do you happen to have pictures of the parents?
From pics of C-Sky blues, they have pigmented shells so it's likely they are selective bred from Blue Dreams (Blue Carbon Rili lineage).
Blue Velvet young start off looking like Red Rili's, but the red goes away as they age, but they do not have pigmented shells like Blue Carbon Rili's.
There's always a rare chance a odd one out shrimp pattern will pop out (rili's and even other colors), that's how mutations are then selectively bred out.
Post pics if you can.
Talking with other C-Sky Blue owners, their offsping weren't red rili's or blue velvets, they had pigmented shells and looked like Blue Dreams.
There are dark blue velvets out there, which don't have pigmented shells, but C-Sky blues (as least the originally released C-Sky Blues weren't. It's a "common name" label slapped on, so it's always iffy) are those (though some stock images of the best of the bunch display a deep blue neo with no pigmented shell, but offspring and other siblings show pigmented shells).