Hi! So I have a 15 gallon tank and I bought a new fish, a balloon Molly, to go in it. However, the Molly is acting very aggressively towards the other fish, and especially my betta. My betta and her were fighting and at first the betta (female) initiated it. But now the Molly is actively going after my betta, who has a torn fin. I'm not sure what to do, should I put her in a separate tank, or see if she calms down after getting transitioned. I just got her today. My tank has live plants, a heater, a filter, and an air stone. It also has a couple of hiding spots for them. In it, other than the betta and Molly, I have 3 neon tetra, 2 cory catfish, 1 suckerfish that I'm not sure what it is, and a snail. She is currently actively chasing the betta around the tank, and not just protecting a single area as it seemed she was before. It looks as though she may be trying to fight with the tetra as well, but they didn't fight back like the betta so she ignores them mainly.