neon tetra prefer to live in large group of 6 or more to feel safe, otherwise they will hide. They also require a large aquarium, something like 80 liters or more so they have space to swim.
If you want to make them school, you should:
+ have 10 or more neon
+ have large tank
+ maybe add some bigger fish to the tank
+ have plants and decoration
+ have a good water flow as well
+ have reasonable lighting, something like 1W of lighting for every 3 liters of water and not brighter.
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