Filament barbs are great,they'll get up to about six inches I think ,and they're a little scrappy.....usually around 3-5 bucks ea. they'll take a little time but the males get some good color
I agree. Very underrated fish. Another option in the same category is Dawkinsia tambraparniei, or the Trade Arulius barb. They don't get as large as the Dawkinsia filamentosa, but are about $4-5 each and are very fast and colorful, too.