ok so not sure if I got this tip here or if it came from my local aquatics group chat about sororities but here it is (tried and tested in my sorority, after my smallest girl lost an eye to the bully).... take everything out of the tank, then cup each girl. rearrange tank then introduce girls back in most submissive 1st giving each 1 5min or so to get comfortable, find a hidey spot & claim it for themselves. Leave the bully(s) for last. float the bully's cup in the tank until every other girl has swam up and then away. (don't worry the bully will probably charge the cup and flair and be a general b-i-t-c-h) once all the other girls have swam around the cup a few times & the bully has settled down then release her out of the cup towards a spot in the tank that the others haven't claimed. If this doesn't work try giving the bully a time out for a few days then reintroduce by the above method. My bully had a 1 day time out, reintroduced I didn't even have the cup outta the tank b4 she attacked again. This time she got a 3 day time out and now the 1 eyed girl who was attacked now pushes the "bully" around.
30gal Planted; Mollys; Dalmations: Sailfin(M), Balloon (F) & Common (F). Sunset Common(F), Julii Corys, Otto Suckermouth Catfish, Hillstream Loach, Leopard Loach, Clown Pleco, Blue Mystery Snail, Tetra's; BlackSkirt, Diamond, Black Phantom, Serapae.10gal Planted; Eeyore (Super Delta Marbled Betta M), hasbrosus Cory, Scissortail & Harlequin Rasbora's, black Neon & neon Tetra's, Otto Suckermouth Catfish. 2gal:group male guppies