I've had a lot of shoaling tetra in my time and the best shoalers if thats what you looking for in my experience are Rummy Nose
By the way, you may be aware of this already, generally speaking most fish only shoal when they feel threatened, for example in the LFS or if you are re-arranging the tank and doing a large water change.
But i do find that Rummy Nose stick together closer than most, even when not in a threatened environment.
In my planted tank, my Neons disperse a lot, i like to think this is because they feel safe and relaxed. The same is true of a lot of my other tetra's.
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