No. First off, Mollies get big, so they need 15+ gallons of water. Secondly, Mollies are brackish and Bettas are not. Thirdly, if you want multiple female Bettas, then you need a group of 4-6 for less aggression and chance of injury/death. Female Bettas may be more tolerant of other fish and females than males, but they are still mean. Hope this helps!! =)