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cant you only keep one betta in a tank at a time cause of there aggrestion though?I have my rubber lip in a betta sorority with fish from failed tanks as far as I've seen he is the bully and so he wont get hurt. I have a singly cory cat from a failed school that I have given up on. Im 1 for 12 on cories. I also have white cloud minnows and some cherry barbs, and two kuhli loaches. Oh and some amano shrimo.
No females are less aggressive. Some are more aggressive and so if you set up a sorority be ready to take one back or rehome it. I started with four one git sick and died, but my tank is healthy. Female bettas really make a good tank. They should be in 3+, 4 is great and even more is better.cant you only keep one betta in a tank at a time cause of there aggrestion though?