So I had some problems with girls getting sick and dying in their 10g sorority tank and I've traced it back, not really. No idea what it is unless its poisoned bugs getting in. But anyway four survived.
So I put them and Buck, bull molly extrodinare (-ly stupid) in with the Caracidae (tetra). He thinks he's a special female Betta, I blame his upbringing. He's known more than twenty girls, survived three plagues, one filtration and chemical poisoning. He even seems immune to one of the chemicals we use which says "very toxic to fish". But at some point every one of those girls has come up to him and flared at him wondering if he would flare back.
So, the word "sororitah", imagine Cartman saying it...
Buck's swimming around in the 10g tetra+ tank and the single bloodfin takes exception to him and starts chasing him. Buck shoots back to Red who flares at the boodfin and gets no response. So ALL FOUR girls come over and flare at the bloodfin! (Red is head girl, full pecking order response) Then they sat there fins extended swimming in formation in the gentle current with buck charging back and forth through them fins full-out and pretty. Buck is nearly twice the size of the girls. As yet the funniest thing I've seen.
Respect the Sororitah! Mollies and female Betta: Compatable!