so dwarf south american cichlids do great wit other fish and stay small
try a german blue ram
golden blue ram
krib they have albinos too
apisto
do some research and see if any of those are to yo likin
and a school of small tetras would be great
and then i would personally bump up the cories to at least 5, more is better for shoalin...and look into panda cories or pygmy. they stay smaller
also yo could add maybe a dwarf gourami or somethin to add a bit of color
IMHO thats not overstockin but someone else might chime in and say it is