Are mollies dangerous? Which fish should I get?

AquaPurifico

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I've heard from numerous people that their mollies have killed many of their fish.
I will be getting some fish soon and am wondering if they are a threat to others.

I have a 20-gallon tank and a male betta fish. I will be getting some more fish and am also wondering what fish would be good.
I have been looking at some fish I like..

A silver tetra
A red platy
Flame dwarf gourami

Are these a good mix?
would fish like these get along with eachother and my betta?
 
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