I wouldn't exactly call a green terror one of the most aggressive you can pick up at the LFS. Maybe mine are weird, but its nothing to grab a jag or texas or red devil here. They are actually more available than green terrors. It took me 6 months to find a LFS with a green terror. When I could go to either of them for salvinis and what not. Besides that, the fish we call green terrors today aren't really the green terror that used to be in the hobby a few years back. Its actually a type of acara and some call it a saum. Much more docile than its predecessor. So I don't really look at them as being aggressive as much as territorial like an oscar or jack dempsey.