I'm new here so be gentle

I've recently acquired a 100l tank and need to stock it. I do have some fish to already go in and am looking for ideas to bulster my numbers.
Current fish are:
4 X clown angel fish
3 X krobia Xingu
I'm looking to stick with the South American vibe and would like to put fish of a similar or larger size. I am quite emotionally attached to my krobias and anything that goes in would need to complement these and not ruin their lives. I do not plan for these to be the main attraction in the tank but whatever goes in needs to be suitable to them.
Current thoughts (and feel free to tell me I am wrong) are the below:
Smaller geophagus species -possibly redheads
Convict cichlids
Blue acara
Dither fish - probably spotted silver dollars
I would love a green terror, but think it would be too agressive/murderous.
As stated I would love suggestions from you all
Thanks