John D. Goulden wrote:

The one combo that I've had 100% success with is betta + neons. The betta
usually flares a bit at the neons at first, then they leave each other
alone.

Yes, that combination works nicely. Otos can be added to that group too.

Has anybody ever kept shrimps (Caridina or Neocaridina ssp) with bettas?