Bettas are easy to breed but than I wouldn't use them as feeders.
You could keep a bunch of different livebearers in their own breeding cage, then the fry stay on the bottom of tank and you get your choice of different fry.
Brine shrimp are fun to breed and they eat leftover food too.
You could keep a bunch of different livebearers in their own breeding cage, then the fry stay on the bottom of tank and you get your choice of different fry.
Brine shrimp are fun to breed and they eat leftover food too.