Well my favorite fish is harlequin rasboro. I know they arnt a characin but they are small like tetras and are so cool.
I have 9 in my 38g tank and they all school together all the time. They are attractive too. I have glowlights,neons,black phantoms, and bloodfins for tetras and they all seem kinda boring. To me by far harlequins are the most active and best schooling fish ive ever had.
- depthC