Fighting fish. They're not going to be saints in the spawn tank.
Who am I? Well I am a Junior Member of the International Betta Congress and a breeder of white HMPKs, red dragon HMPKs, black/red dragon HMPKs, metallic multi HMPKs, blue masked HMPKs, and now multi color HMs. Soon to add black HMs. I will be showing in New Breeder class in fall of 2012.
I know nothing about sororities, so don't quote me on this.
Try removing her completely and then putting her back in at a different time. I read it in the betta book I got from Petsmart and they said to do that when breeding betta fish, so maybe it will work for sorority tanks, too.
"So God created the great creatures of the sea and every living and moving thing with which the water teems, according to their kinds...And God saw that it was good."
new members will have to "introduce" themselves and establish position. They will fight it out no matter what. But you could try putting her in a trap or float her for a few days before releasing. Both the new and old tenants will get used to each other and calm down a bit. This doesn't guaranty no fighting though. They might decide to establish rank later..... so keep an eye on them.
I find currents help reduce aggression. But don't forget to make certain areas current free, where they can rest and relax. LOL
Don't remove the one being bullied, remove the bully, re-arrange the plants, and then re-introduce her.
10 Gallon Tank:
~Countless Pond Snails~1 Espe's Rasbora~1 Harlequin Rasbora~ 5 and 5.5 Gallon Tanks:
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Many of my scaly friends from my original tank from 2011 have passed, except for two! I am in the process of re-doing my tank. :)