As of now my 220gal is centered around the Upper Usumacinta Basin in Guatemala, more specifically Lachua Lake.
My inspiration came from this research paper I came across:
https://www.researchgate.net/public..._Lachua_Lake_Upper_Usumacinta_Basin_Guatemala
It goes into great detail the species that are found in not only the lake itself, but also the different micro ecosystems within it. While my current robertsoni are not specifically from this area, the species itself is (as are the rest of my stock).