Interesting info guys, and just another reason why common manes annoy me. We're argueing over what is the "true green terror" when "green terror" is just a name given to a fish probably by someone who wanted to make it sound a bit more interesting and make it more likely to sell. Does anyone actually know which species the name "green terror" was first given to? Was it actually given to the true A. rivulatus and not to the much more common gold/silver saum? IMO its unlikely, the true "green terror" is probably a gold saum, because that has been much more common in the hobby which is where the name "green terror" almost certainly originated. What seems to have happened is that the gold saum has often been incorrectly named as A. rivulatus, and because the hobby unfortunately shuns Latin names in favour of meaningless common names the name "green terror" has become synonomous with the species name A. rivulatus and not with the fish it was originally given to. So when people talk about the "true green terror" what they mean and what they should really be saying is the "true Aequidens rivulatus", because the two are probably two different things.
In fact there is no such thing as a "true green terror" as there is no convention governing common names, so if I want to call my grumpy green severum a "green terror" then you can't tell me I'm wrong.