Many people say it's not okay to have beta's together. People also say when you put beta's together; they will start to fight immediately, and they will kill each other. Well, I am here to tell you that this isn't always the case. You can keep female beta's together and maintain the peacefully (the tank NEEDS to be cycled). You can also put a male or female in a community tank, and there can be peace depending on what fish there are in their and many other things. Keeping beta's together(females) can be possible. There are things and considerations to achieve this goal. First, you should have at least a 20gal long. A 20gal long will provide them to swim and have space. You will need to have more hiding spots than usual. The reason is that they need hiding places if one of the betas get mad and go on a rampage. (6 or more is recommended) Next, your temperature should be around 80, but I keep mine at 76. Remember the lower the temperature, the more oxygen you will have. Third, they should have a variety of food. Pellets to flakes are the best. What I mean by that is you can feed them pellets, flakes, brine shrimp, blood worms, insect larva, etc. Feeding them twice a day would be best. Fourth, they should also have room to swim from one side to the other. I highly recommend no artificial plants because they love being lazy, and they can rip fins while doing that. I would also highly recommend not to get a strong filter. The reason why it's not a good idea is that if they get too close to the filter pour out, then their fins could rip easily. I would highly recommend what Aquaphobia said which was add a sponge filter. They are perfect. Last, I will talk about keeping a sorority together with other fish (sororities should be kept in a group of at least seven females). I keep my sorority with black neon tetras, bristle nose pleco, cories, and ghost shrimp. Always remember when you have a sorority with other fish make sure they are pH and temperature compatible. You can have a male with some females, but I would make sure you know your stuff about beta’s and always have another tank or divider if something goes wrong. You can also have more than one male in a tank, but you should have a huge(when I mean huge I mean 250gals or larger) tank with lots of plants, watch if they flare at each other, female beta’s, other fish, etc. Keep in mind that having males with females will be a big responsibility if you do this. You will need a lot of jars (200+) for separating the males when they grow up to be bigger. If you don't separate the males when they are older you will see a lot of fighting and fins being ripped. If there is flaring, I would watch them and see if they continue that behavior. For introducing these betas to a tank, I would add them last if possible, so they don't find a spot first to claim. I hope if you had any problems with your sorority, this has helped If you have any questions, please let me know.