How many female bettas?
If you spring for a well-planted 10 gallon with lots of hiding spots, you could try to house 2-3. I’d probably get 3 so any aggression is spread out more, and it’s not just one alpha fish chasing a shyer one. I wouldn’t try multiple bettas in anything smaller than a 10 gallon. Also, be prepared for the real possibility it just might not work out and be ready to house them separately if you happen to pick up super aggressive girls. Females can be just as aggressive as males, so they need places to hide and escape from each other. I personally always keep my females in their own separate tanks, just like my males.
