Rasboras do tend to jump IME, but man a nice school of Rasboroides vaterifloris
would look nice in there. Also, the jumping tends to be due to being spooked by abrupt light changes, something you shouldn't have an issue with using a dimmer.
I've had them before and they are excellent schoolers. The pictures don't do them justice. In person they're every bit as orange as ember tetras, but bigger.
Or how about Rhadinocentrus ornatus? One of the few rainbowfish that likes acidic water.