Yep they are NW from Brazil.
They are really close but lack the red.
The common name is Brazilian Black and Whites. They look like little 8 legged battle tanks :p
That might be awhile on the smithi. They grow super slow. :p My bigger one is going on 2 years old and right around 2.5"
Easier said than done but I'm going to try and feed my tiny ones a couple times a week.