thanks for the additional pics. no, not a morph and not new species either.
the top fish in the pic (i.e. the dark colored one) is retropinnis. some individuals can be darker than others. And they have a grayish base color (except the ventral region) so they could look dark when out of water, but all the characteristics match. Also, that fish the guy was holding was the one i used for all four meristics, and as i said, all the numbers fall within the range for retropinnis.
the bottom fish in the pic (i.e. the one showing mostly the ventral side) is mokelembembe. If you went back to my first post in this thread, i said that's the fish that reminded me of mokelembembe at first. The patterns match up, as well as the pointy snout.
My initial hunch tells me there are 2 species here, but i guess i was giving the benefit of the doubt and assumed all the fish are the same. Not surprisingly that's when things don't match up. I asked toyin, and when he said there are 2 species, i finally stepped back and was convinced that's the case. I suppose Occam's razor principle won here. It's clear now with all the pics that there are 2 different species, and each matches the corresponding ID.
And both retropinnis and mokelembembe are found in the Congo, and have been exported for the hobby for a long time. I don't really know why that particular supplier hasn't come across these species before...perhaps has to do with the collection area...i'm not sure.