There has to be some regional population variation. Any info would be greatly appreciated. There are a couple localities that I am aware. The most common one, and probably the one's you saw, come from the Rio Momon near the city of Iquitos, Peru. The second locality is from Tefe, Brazil and is not as widespread as the Peruvian variety.
Males usually have clear and longer ventral fins.
I agree with Bob, this is a very pretty Apisto. It is common in the Nanay and Maz n, where Apistogramma are otherwise rare and represented only by A. eunotus and A. cruzi. Generally, the fishes were associated with leaf litter. They are well-shadowed by forest, but fishing was generally done in open areas. Leaf litter constitute a significant portion of the substrate.