OMG - been after some of these for ages, extremely jealous
I would anticipate them to be similar in aggression level and size to the Northern Blues although I have no personal experience and do not know of anyone who has.
However, I do have a large group of Blues. These guys grow to around 5-6inches on average and can be hihgliy aggressive. They will occaisionally take chunks out of smaller fish (I do mean occasionally), they will also hunt and kill fish up to around 1inch so do not keep with juveniles. I have also found the blues to work best in a larger group that is male dominated, I currently have five adult males and two adult females in a 400litre tank and this has greatly reduced the agression amongst them.
Hope this helps a little and keep us updated, along with lots and lots of pics
