If you're looking for a multiple fish set up (as it sounds like to me), and have your heart set on bettas, 3 females is a really good choice. They generally look rather lacking in the color department when you're looking at them in the store; but boy oh boy do they blossom when you get them home in a good sized tank and well-fed!! If you don't yet have your heart set on bettas, though, I would also recommend male guppies. They are just as colorful of a fish, without having territorial issues. 5 or 6 of them with various colorations and/or tail types makes for a fairly active 10ga tank. They'll go from top to bottom, too, so there won't be any visual 'dead' areas. Of course, cory cats are always fun to watch. Hilarious little things! Unless you want to have fish virtually indefinitely, do not mix in any female guppies. I started a guppy tank 5 years ago and made that mistake. I had no idea what I was getting into, they multiplied faster than the rabbits my siblings and I kept as kids! I supplied the dorm residents at my school wishing to keep fish with beautiful, active, healthy fish until I graduated this past December. I ended up having to teach a lot of people how to properly care for fish, but it was worth it. You'd be surprised to see how far a little bit of color and life can go toward keeping people sane in a dormitory setting!
