What FISH IS SUITABLE ?

I have a 2 gallon ( 8 - 10 litres ) fish tank.
I have a small filter.
I am looking for non-tropical fish.

What fish is suitable for me ??
I please be specific not just ' goldfish ' ... detail please :)

Also what are some small pretty non-tropical fish that could thrive in this environment ??

THankyou!
 
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