I know these are older posts but as a long time discus breeder with a preference for wild type discus it was a pleasue loking at all these wild discus photos.
The Japanese OTF market seems to get the cream of the wild caught wild discus but they are much more willing to pay higher prices than most American hobbyists so they get the best fish. This true for all tropical fish.
I know that Japanese hobbyist get L-Number plecos we never see.
I like all wild discus but I have bred representatives of the Brown, green and Blue discus so now my pet project is trying to breed wild Heckels.
I have ten I bought last year as barely 3 inch juveniles and they are on average about five inches. That take twice as long to reach maturity as the other wild types so I expect to have to wait another year to pass before they might be old enough to spawn. I have dubbed it "The Heckel Project. In the meanwhile they are just a joy to have them in my livingroom display tank. They are great tranquilizers, just watch them and the everyday stresses just sort of flow away. Heckels are an especially easy going good natured discus. They prefer to coexist peacefully, not engaging in a struggle for dominance that the other wild discus tend to do.
I guess the best way to describe it is they are very "polite" with each other.
In a past set up I have kept large wild royal blue discus with the Geophagus cf surinamensis and they actually made a good combination.
I'm not really up to date with all the different names given to this group of eartheaters but they and the discus each went about their business and never had any problems getting along with each other. The Geos were spectacular fish in thhere own right and they complimented each other in shape and behavior making for a very nice display. This is something most discus keepers would have trouble imagining. They often think of discus as being too delicate so when they think of companion fish they tend to limit themselves th Rams or other dwarf cichlids. It's too bad.
Actually aside from the Geos I have found the Dwarf Pike Cichlids to be another good cihlid to keep with discus. In fact I have some with my Heckels now.