I just saw a group of these guys at the Baltimore National Aquarium (took my son on his 5th birthday for his first time). They only had a few in there (in with a shoal of red bellies), but they were huge. I believe they were pushing 4.5-5" easy, probably 5 or 6 in there with the piranhas. There were even some neon tetras in there. Obviously it was a giant tank, so none of them were paying any attention to the others, but it was cool to see. Never seen exodons that large in real life though, it made me really want to do a tank full of them one day. Having a full tank of 5" exos would be insane.