Ok, have time to post this:
Reasons betta girls harm each other.
Same favorite hidey.
Same sounding name.
Nothing else to do.
Flaring at friends.
Bullying for status.
How it works:
I've got a little one, Fins, maybe one inch from lip to end of not-healed-yet tail who got nipped twice because she's precisely the same color as my largest girl. The largest girl, Sheen, isn't in charge because Cherries is a light touch and the rest of the girls prefer her in charge. Cherries and Blue sleep together side by side tail to cheek. Blue loves me the most and nearly froths at the mouth when I give her attention. Rose gets confused by it but hangs out with her anyway. Rose protects Petal who is precisely the same as Rose but a month younger. Petal likes to follow Purp around and see how Purp copes with other fish. Purp is bullheaded and will barge into anything, I've seen her knock the algae eater off like males knock snails off. Purp protects any fish near her but Petals doesn't like competition for her closeness to Purp. So Brownie is a loner and Purp likes to see how she's doing then brings Petals along but Brownie is Rose's size and this drives Fins away from Brownie and Sheen sees Fins alone and swims over to nip her tail again.
I put fins in the 4-way, mel/pima in the water with some stressguard and Sheen became nuts with jealousy then began harassing everybody but made the mistake of going after Blue (who's half white) whom everybody sees as my favorite and the entire pecking order stomped on Sheen's head.
Why is Sheen so cross? Silver looked almost the same and was Big Fish when Sheen came home. Sheen thinks she inherited Silver's job.
Silver was a great sorority queen and ruled with an iron indifference and lightning fast waffling. So Sheen thought she was in charge until Cherries wouldn't let her sleep for a day after attacking Fins.
I don't think Carnation, Teal and Red even knew there was a problem. Red came home with Fins, is the exact same size, behaves the same way and nobody
has touched her.
Carnation is the oldest girl and remembers who was in charge before Silver and supported Cherries, now she's quiet and hides behind the filter to sleep.
And the bloodfin twins swim on.
The molly boys take turns chasing each other.
The male guppy constantly loses the nearly three inch female guppy.
The algae eater darts around obliterating anything that isn't a plant.
Twinkle (brilliant personality) and Nod (same color as Twinkle) still don't know each other exist.
So, now you understand why you need so many girls for stability in the tank and why we love sororities so much.
Teal killed herself today. Crowntails just won't stop eating for any reason, some even have pica and will eat snail shell, little rocks, loose carbon shards...