20 gallon tank suggestions?

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They should do just fine! My cories usually stick to the bottom of the tank so it wouldn't really matter because the tetras would swim farther up I would think
 
I have 2 male guppies, 7 pristella tetras, 1 male blue ram and 4 kuhli loaches in my 20 gallon. The ram chases the tetras occasionally but hasn't hurt any. No other signs of aggression with that group.
If I had to do it over again I'd probably go with neon tetras vs pristella just because i have sand substrate that matches the pristellas too closely.
 
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