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They would look like a orange and silver tornato if you accidently scared them, the neons grandma had.. it was a long time ago and she got the old common guppies so all the fish were the same color..
I have a nice group of Bloodfin tetras, they spend the day as a school playing in the filter outflow, or they chase eachother around the tank in a single file line.
Though my neons look nice a school, they really only form up when scared. They mostly just do thier own thing all day. The Bloodfins however, spend most of thier time in a school.