Sounds like a start.
One thing I can add, I once tried a group of 10 tiger barbs and 10 green barbs in separate 55g tanks. It very well could have been my particular batches of fish, but one by one, the weakest would get picked off until 1 remains. It takes months for this to happen.
I only have 2 green barbs left. One is a stunted tiny one and the other a full grown adult. The adult chases the stunted one constantly, but I have no where else to put either, so it will one day be survival of the fittest.