Bought this guy last year as part of a pair of S. wellingtonae but I've been a bit dubious as to whether or not it really is. It doesn't help that it has a regenerated tail...
Seems like the best fit. They look similar although all the photos I've seen of S. intermedius seem to have orange rims to their eyes. You can't tell from the photo but this guy has completely grey eyes.
Just because there's a fair difference in colour and pattern between the 2, along with the fact that the pair came from a gentleman who liked Piranha's... I don't want to breed a pair of animals if they're not really a pair