Hey, well yeh i have an aggressive betta.
So the story, i had 6 neon tetras in a tank. 4 died, leaving 2, they grew strong and were healthy, so i decided to add a male betta, seeings as everywhere says they will get along perfectly. They got on perfectly well for 2-3 weeks, then one morning, i find the betta chasing one neon, with the other injured hiding under a rock.
Betta was removed and put in its own tank. I am unsure why the betta turned aggressive. The 2 neon's grew strong and healthy again. I have now added to the neon tetras and their is now a school of 8/9. I was wondering whether you think it would be ok to pu the betta back in now and will be more reluctant to be aggressive with a whole school instead now?