I totally agree that what we consider a school is really just a small group, comparatively. That being true, a small group of no less than 6 can still exhibit schooling behavior in an aquarium if their needs are met.
I have kept a group of 6 happy and healthy for a couple years(before total system crash) and now have 2 groups of 8 for several years (in separate tanks) that both spawn regularly.
I attribute my success to 4 basic requirements: plenty of space (maybe no less than 100 gal for 6), decent water quality, regular and frequent feedings, and lots of flow (only times I have been successful was when running Tunzes).... well, maybe 5 requirements.... they also need coral they can hide out in.
Hope this helps.
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