I was thinking about adding one in with my crowntail because he is blind.
He used to be very aggressive, but he is not so much anymore. I also know he doesn't get spooked too much, considering he is blind, lol. He follows me at the surface of the water when I blow on it. My VT is sort of aggressive... Not as aggressive as my CT was before he went blind. I was thinking it might be a good way to maybe keep him stimulated since he doesn't move around as much, and if he tried to attack the shrimp, well... he misses his pellets 90% of the time, lol.
Edit: also, do they eat betta food that sinks to the bottom? Most of my CTs pellets end up at the bottom, lol.