Ok so you want a tetra that "ain't too rare" but is also not "too common"?
Honestly ive been scratching my head at your posts the last several days. Many people have made great suggestions but you keep deeming them "too common" or "too rare" with seemingly no criteria on your construct of rarity for us to go off of.
Nevertheless, im gonna go ahead and suggest alestes tetras (brycinus longipinnus or bryconalestes longipinnus). They are some of my favorites, medium sized, active schoolers, impressive when fully grown in a large school.
