I think it depends on the general disposition of your beta. I keep 7 neon tetra with my beta. When I first introduced the neon tetra, I set aside a few hours where I could be right by the tank observing his reaction and ready to rescue the tetra if needed. At first, my beta followed them around the tank, he was curious about them. After a little time, the beta and the neons kind of went their separate ways in the tank. Now they seem to occupy different levels of the tank primarily. I feed the beta first at feeding time, and that gets the neons all excited to eat, therefore less of their slow sinking pellets go to the bottom of the tank. Good luck with your fish keeping adventures!