Cookie the molly is bossy. Never physically damaging but shes traumatized other fish pretty good. She is currently in this 20gal. The skirts run from her and she changes targets all the time so its never one fish all the time, but I still worry about their happiness too.
I tried getting another female molly for her but that one was much smaller and hid all the time and was scared of her.
I can move cookie to her own tank by herself, swapping her with the platy, guppy, and molly who currently reside in it. Downside is cookie is a big fish, and the tank she would have to herself (plus 1 mystery snail and some ghost shrimp) is 10gal. Is a solo molly a bad thing? One molly may be okay with the bioload but ehhh. The current molly in this tank is tiny and very timid, hence why shes with them.
I can try to locate a larger molly companion and hope it works out... only mollies I can find her size are sailfins. Downside: if this doesn't work out, there's nowhere to put another large molly. And what if BOTH mollies are psycho? Then there's 2 chasing the poor skirts around.
Leave her to it, as shes not harming the skirts and they dart at one another anyways without any harm.
Rehoming isn't an option. Cookie is family and has been with us from the beginning.