a sparkling gourami like this one http://www.kara-inci.nl/trichopsis_pumilus.jpg
with a female betta the gourami will also be a female.how many can be with her.the tank is 10 gallons and what is the care level of it.i really need to know.
Female Bettas are peaceful and make a nice addition to most peacful community tanks.
Personally I would not house more than 5 or so 2'' fish in 10 gallon tank.
Over stocking can lead to fish death, and other problems.