They were probably referring to wild bettas, they can live together. The aggression was bred out for people to bet on. But I don't think that domesticated \bettas can, just my opinion, I don't know what @Crispii thinks though.
How would I go about slowing the flow of my marineland magnum internal polishing and canister filter. It goes all the way across my 4 ft. tank with a extremely high flow. And I can't get the flow direction adjuster to stay on.
Did you get her from a lfs or online. If lfs, she's probably pretty young and that is a pretty good size for a newly bought one from the fish store. But once they get older they'll get much bigger ime.
One of my lemon tetras, they are such boisterous eaters, especially in a smaller tank. I've had them for a year I believe. They're in the same tank with my angels so I call it the "Sweet & Sour Tank." Love these fish, I want to get more color on them, in time.
I actually believe some fish can live in smaller than 5 gallons. It has been done by many, but you just have to pick the right ones, examples: scarlet badis, some killis, or maybe some brigittae rasboras.
How old is she? Or how long ago did you get her?
You can never tell for certain, but younger newer moms won't give birth to as many, but older ones can give birth to over a hundred at a time. If this is her 1st or 2nd time giving birth after you got her from the pet store, I would say in the...