what kinds of colorful fish can go into a 20 gallon ?

you can have aggressive or non agressive fish. If yu like the color I would go with some guppys that have wonderful color and somw platys or swoard tails.
 
There are a ton of fish that would work.

Mollies and plays are smaller usually very pretty fish.

Rainbow fish get just a little larger, but look beautiful as well when they get their full colors in.

Small tetras like neon tetras are also really pretty, but there are tons of fish that would probably fit what you're looking for.
 
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