There's nothing scarier than people who are 100% certain! So we're all okay with our fish.
I had a grab bag tank in the classroom. It had dozens of that summer's quick growing paradise fish and swordtails galore as they liked a little stream outlet from the filters outside. The paradise fish liked the reeds and slow areas of the pond, but were all over the 75. I had multiple big males - and no problem.
It also had deformed platys from a student, and some platys I'd bought that had a percentage of balloon young. The parents had looked healthy. It was a peaceful tank. It was eventually poisoned by an alt-right nazi kid as revenge for the Holocaust unit I taught.
For aggression, I'll take a paradise fish over a 4chan nazi, anytime. They were larger fish than I like, but really were easy going. Given how they were most popular back when a 10 gallon tank was big, I can see how they'd be seen as aggressive.
