for the record, I believe schooling actually refers to an aggregate of fish that swim in a polarized manner... that is they all face the same way and are synchronized. So technically we would never see real schooling in a tank. Shoaling is what we are really referring to: an aggregate of fish that are loosely associated with each other.
Ive already mentioned what I think of damsels and chromis schooling. Matt, no matter how big or small the school of chromis, you almost invariably end up with one or none over time. This has been well documented. Like I said, chalk basslets, almost any group of cardinals would work. And yes, scissortail gobies (which are actually a dartfish) would work as well; note that firefish will likely kill each other.
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