well he is with the mollies and i have been told that he might think they are other bettas but the fry are about a week olddepends on what sort of fry and how big they are.
but if he is picking on the other fishes in the tank then he will probably pick on the fry as well.
well i say a week old. its been a week since i got them out of my big tank they could have been in the big tank at leat a week as i didnt see them till i was doing a water change so with that said they are about 1/4 of in so how old do you think they areYeah betta might eat the small fish.