Yes, groups of preferably 6 or more are better. I'd keep one school of tetras in each tank with 8 of each, and return the other three.
I think you'll find that CAEs will get too big and too aggressive for your tanks.
Welcome!
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current setup:
5.5 gallon low-light planted tank
-1 dwarf puffer named Beep.
for reference: my name is Julie 
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