Papa Red wrote:

Question, can I have more
than one per community tank? Would they gang up on the other fish? Or if
I get a bunch of them in one tank by themselves, other than the one inch
one gallon rule, would there be any other restrictions in the number
that can be in one tank? What other species of fish would be compatible
with females Bettas, the same as with the males?

Bettas make great community fish. Of course you should have only one
male per tank (unless the tank is very big and the critters can
establish territorties). There should be 2-3 females, so that no single
one has to bear the full the attention of the male (harem system). The
females will establish a rank order maintained by flaring and chasing,
but there should be no actual violence. I have mine together with neons
and otos, and that works just fine. Avoid fin-nippers (which might
attack the male) and fish with large red or blue fins (which the male
may attack). Fish preferences should be for soft, warm, acidic water,
just like Bettas. Note however that Bettas can have very different
personalities, so YMMV.

Hint: If you take half a food tablett, make it wet and press it against
the front of your tank, it will stick. Watching males trying to
monopolise it and the females to get to it (especially if there are
several) is great fun.