In general most african cichlids aren't going to be peaceful, and most of them also won't fit in a 20 gallon. Angelfish can be hit or miss in terms of peacefulness but they do generally get too big for a 20 gallonWhat are some interesting fish to put in a 20 gallon tank??? That are peaceful, not as aggressive, but nice??? Are Angelfish or African Cichlid one???
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What are some interesting fish to put in a 20 gallon tank??? That are peaceful, not as aggressive, but nice??? Are Angelfish or African Cichlid one???
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My stocking plan for my 20 gallon is 5 corydoras, 8 cardinal tetras, and a pair of either apistogrammas or ram cichlids. That's a pretty solid stocking plan to emulate, though if you don't have experience maybe swap the cardinals for neons and hold off on the apistos or rams until you have several months of clean, stable water quality. You could also replace the tetras with harlequin rasboras, but not scissortails.
A dwarf or a honey gourami would work fine, as would a betta in some cases. The Bolivian ram is a hardier alternative to the German blue ram, although it is less colorful (but still a really awesome fish). Apistogramma cacatuoides and borellii are both two of the hardier type apistos but should only be introduced to well maintained mature tanks (as already noted).
Here are some nice schooling fish:
Tetras - rummynose, Cardinal, green neon, lemon, diamond, glowlight
Rasboras - harlequin, blue harlequin
Barbs - cherry, pentazona, checker
Other - beckford pencilfish, threadfin rainbows, furcata rainbows