ok i think now that one of my seng might try to eat the other. the one is around 7" and 5" it looks like my smaller one might fit in the largers mouth. i got them at the same time and they have never been seperated and got along great till the last water change then i noticed that cain(the big one) was bullying able(the little one). i havent seen any agresion today but it still worrys me a little. they were my first fish since my beta when i was a kid.