Originally Answered: Questions of betta fish n names?
No, male and female Bettas can not be housed together. They're put together only very briefly when breeding.
Betta breeding is a time consuming, patients testing, expensive ordeal.
First step, buy a book on breeding Bettas. Join a good Betta forum. Do a TON or research. This is not an easy thing to do, and if you don't do it right, you'll have at least one dead Betta. (You might have a dead Betta anyway, but at least they'll have a chance.)
Also, you'll need two very well bred Bettas, whose genetic history you know. Not Pet Shop Bettas.
Here are the basics you need to know for your Bettas to live a long and happy lives:
1. A cycled ( http://www.firsttankguide.net/cycle.php and http://www.aquaticcommunity.com/aquarium... ) 5 gallon or larger aquarium is minimal for a single Betta.
You could use a 10 gallon divided to house 2, so long as the divider is opaque, (transparent dividers stress the 'ell out of Bettas,) and so long as the divider reaches ALL THE WAY from the florr to the lid of the tank. Bettas can jump through very small spaces that don't look large enough for them to fit, and at some point they will. Then you'll have a disaster on your hands.
2. A filter is necessary in any tank in order to keep the water aerated and free of toxins. For Bettas it is best to set the filter flow to low, as they are not very strong swimmers. Another good option is a sponge filter. If your current filter is too strong, you can remedy it by covering the intake with a pair of pantyhose, putting a tall plant in front of the output, or follow these instructions to outfit your filter with a simple current/flow reducer: http://www.petfish.net/kb/entry/347/
3. A heater is essential. Bettas need warm steady temperatures of about 80F, to thrive. Constant fluctuation leads to stress, which inevitably leads to disease and often death. You can find an inexpensive heater for a small tank at any fish store.
4. In a 5-gallon or larger tank, weekly 25% water changes, using a gravel siphon are necessary. Water conditioner must be added to the new water before it is put in the tank to remove toxic chlorine, chloramine, metals, etc. Never change all of your Bettas water, as this shock your Betta, and ultimately weaken him. The Betta stays IN the aquarium during water changes.
5. Bettas enjoy a well planted aquarium, (use live or silk plants, plastic can tear their fins,) with a cave or two for exploring and resting. The tank should not, however, be stuffed with plants, as Bettas also need a good amount of room to swim. (And swim they will if given enough space.)
6. Feed your Betta a good staple, carnivore- specific, pellet or flake diet, substituting frozen foods such as brine shrimp and blood worms several times per week. Reserve one day per week for fasting.
When properly cared for, Bettas have been known to live for 10 years. I have personally known them to live for 6.
Oh, and there are lists of Betta names all over the internet. IMO though, it's best to get to know your fishy, and give them a name based on their "fishonalities".