How many neon tetras can i put in a 10 gallon for good school behavior?

you could have i would say up to 15 as long a nitrifying bacteria is present in the filter to cope with the amonia made through decaying organic matter. they should shoal fine in a 10g tank.
 
i have 20 in my 45gallon and they often dont swim all together they kind of split themselves up all over the tank but they still look super cool
 
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