I have a lovely Betta male, hes in a large tank with 18 other fishes including, swordtails, neon tetras, glowlight tetras, mollies, guppies, a red clawed crab.
He is a great character and is consistantly making a bubble nest (the water current is quite strong and so his spit bubbles always blow around the top of the tank) I did move him into a 12l tank of his own with very low current of water flow and his bubble nest stuck beautifully to the side but sadly I am yet to find a female for him. Female Bettas (or Siamese Fighting Fish as they are mostly known by in here the UK) are very hard to find... just like female guppies to be honest.