I ask questions about stocking all the time so I'm sorry. Vut here's another. I've almost got something I'm happy with. I have a 29 gallon and it is 30 inches long.
Rosy Barbs can be quite nippy and also prefer to be in groups of 6+.
As long as you had a ratio of 1 male Ram to 2 females, then they should be fine.
How about 6 Pentazona Barbs? They are similar looking to Tiger Barbs but have a peaceful temperament.