[Sweeda88]

You already have WAY too many fish in that divided 10 gallon. The most fish you should have in each side is ONE Betta.

 

[Sweeda88]

It has to do with bioload and aggression. If you keep Bettas with other fish, you need enough space so that they don't pick on other fish. Also, with guppies, who are very active, they need more space.

 

[Sweeda88]

Also, females should NEVER be kept together in the way you're doing it. They need a sorority type setting (a 10 gallon with at least 5 girls) to keep from killing each other in the long run, no matter how they act now.