Actually, the "green terror" nickname started with the original rivulatus imported into the hobby in the 1970s, not stalsbergi. The confusion comes because the question of the day was which is the true
rivulatus. Some at the time thought the Peru fish (stalsbergi) was rivulatus and some books and articles had photos of stalsbergi captioned as the true rivulatus. Of course, the Ecuador fish has been confirmed as rivulatus, hence the new name for the Peru fish, stalsbergi.
As for white and gold edged rivulatus: "These fish got the name "terror" for good reason, though. They were far too aggressive to pair up and spawn; even in a large tank, the males trashed any and all females paired with them, and the divider method did not work with them as it can for other large aggressive neotropical cichlids." (see following link) Meanwhile, in the early 80s a German article called stalsbergi the "green terror that isn't." This is another source of confusion, because at the time some thought stalsbergi was rivulatus, but in reality it's stalsbergi the article was calling
the green terror that isn't, because it was known to be a very similar, but separate fish from the original green terrors, rivulatus. Good source for this history is the Wayne Leibel article
here, I've seen two or three articles by him attempting to clear up this confusion.
If you've had wild rivulatus (I have), they're plenty aggressive, even at an inch or two.