I have never met a Betta I didn't LOVE. (Satin is indeed one of the nicest I've seen). Don't tell him I put it that way I wouldn't want to get "that look" LOL.
Yes, little females can be kept in a group of 3 (which is actually what is recommended) and I believe that if there was not anything else in there with them a 10 gallon would be okay for them. Sorry but you couldn't have a bunch of cories and otos with them. Maybe cories or otos, but not both. (I would say 2 cories or 3 otos)
Hope that helps some.
Rose
