I had four that schooled for about a month. Schooling is more of a "safety in numbers" thing and usually doesn't work once they're in captivity. Once they figure out they can't get out, they realize no predators are coming in. I now have two left. Mine is a 55, so your results may vary. To reproduce true schooling you would need something else in there to keep them scared which would most likely end in disaster. It would be cool to see a school sustain itself in a tank, watching the four was enjoyable while it lasted. Eventually one got bigger than the others and would bully them so bad they would sit in the corner and twitch all day. They wouldn't eat anything. The two remaining are the biggest and the smallest of the group and the small one is the same size while the big one has at least tripled since introduction. Good luck.