Great looking fish Dieses & Man of Fish!
From my personal experience Cherry Barbs should be kept in pairs at least, with preferably 2 pairs being the minimum. I have 3 pair in my 36 gallon with one female being the "Veiltail" variety. Even though they are considered a schooling/shoaling fish they rarely ever school together. Having too many in too small of a space is probably worse than having not enough in a large aquarium. If any of that makes sense................
I like that Betta, Man of Fish!