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I've got cardinals and Foersch's barbs in my tank and they school pretty nicely, but the tightest and most consistent schoolers are my dwarf red-fin rainbow fish. If my tank was bigger those would be the first things I'd add more of.
Another vote for White Clouds here, though I prefer the regular ones over the goldens. Mine are in a tank with some shrimp so they feel no pressure at all but they still school up a good bit of the time. They are a ton of fun to watch, they play and chase each other all the time and love to swim into the bubbles from my air stone, let it shoot them to the top of the water where they get shot across the tank by the water from my spray bar, then swim back and do it again.