It's not confirmed yet, but the owner really liked the rio amaya pencilfish View attachment 220995
And the honey blue eye rainbowfish
View attachment 220996
Interesting - they’re not a Pencil I’ve come across before. They are tiny though - an inch long, same size as Marginatus (personally I think I prefer the marginatus colouration) - is your client going to be able to see them once they’re in the tank (especially given they hang out in the top 6 inches of water typically)?
Those Rainbows do look pretty too - I have a shoal of Neon Blue Eye rainbows, and they are beautiful little fish, I love they way they move too, like little Hummingbirds.
Not my picture, but mine have this exact colouration: