I did find some more info (not much) but it points to a few things...
The Decampsi with yellow is found in Ndole Bay, and is often referred to as E.decampsii "Ndole"
I don't speak the language so I was unable to register on the only site that appears to have photos of both fish...
http://www.zoopet.com/fiskar/fisk_resul ... &pageno=24
Looking at the thumbnails is still worth it as the differences are obvious.
Ad Konings book, Back to Nature, Guide to Tanganyika cichlids shows photos of Ectodus from the North on page 77 from Burundi and the fish also appears elongated, and far less yellow in any fins.
The pic of the male at Namansi shows more yellow and Ad mentions that the Ectodus in the South have the yellow in the finnage.
As for which variant is the "true" E.decampsi... I guess that is up to the reader. The originally described species (Boulenger, 1898) was only recorded as "Tanganyika" so we have no idea if it was the Southern or Northern variant...
so you can either say the "ndole" is the true decampsii and the non-yellow is the "sp. North", or you can say the Northern variant is the real fish (As Mark's buyers seemed to feel) and that the "ndole" is the sub-species.
I finally got a few half way decent photos... after about 200 photos...
male:
male and female:
I'd say I have the Northern type... agree? disagree?