Silvery fish tend to shoal more, as long as you have enough of them and the tank is large enough. The African moon tetras in the video live as a shoal, but their camouflage is reflection, and they probably live in very bright waters, like most other silvery tetras. Dappled bright sunlight, and silvery scaled fish are pretty good camouflage out in the open, and large groups are effective defensive strategies.
If you really want shoaling, go for nothing but silver, rummy nose sized, in a 1.5 m tank. Unfortunately, basic silver tetras aren't big sellers so they are often not stocked.