I saw this on another site and so I wont plagerize (sp?) I'll just quote it. I'm sure it has most of the info you need to have a successful breeding.
You will need
Lots of live and frozen foods
5-10 gallon breeding tank
gang valve to control air flow
glass chimney vase
lots of silk plants
small heater (submersible only!)
Live food cultures (microworms,vinegar eels,baby brine shrimp)
Within 2 months you will need
at least a 40 gallon grow out tank
every jar you can get your hands on (so start saving now!)
Before breeding your bettas,you will need to condition them for at least two weeks. Condition means to keep thier water especially clean and feed them twice a day on live and frozen foods.This will prepare them for the spawning.
Set your tank in a sturdy spot where it's easy to access but not in a high traffic area. Fill it half way with clean dechlorinated water.Add your heater, corner filter,plants etc..
Set your heater to between 80-82F, the warmer the water the faster the eggs will hatch. Which isn't exactly a good thing because that could lead to under-developed fry. 80F is perfect. Adjust your gang valve so that the sponge/corner filter let's out one bubble per second.
Bunch your plants close together in one area to provide lots of cover for the female. Cut the styrofoam cup in half longways and float it in a corner, the male will build his nest under this. Don't ask me how they know to go there, they just do.
Ok, so you're ready to add your bettas. Here's the standard procedure, add your male and your female at the same time, putting your female IN the chimney vase so the male can't get to her. He will be extremely excited and she will be scared but she'll soon relax when she realizes he can't get to her. He will begin working on his nest and when you think it looks full and ready, go ahead and release her.Usually after 24 hours. You'll need to cover the tank to give them privacy but you should keep an eye on them at all times. If the female is getting beat badly or not cooperating go ahead and remove her and try procedure #2 in a couple of days.
*Procedure #2 is to add the male to the tank first, let him build his nest,then float your female in a small clear speciman cup, she'll get excited right away and he won't feel pressure to build a nest in a hurry because he already has one going. You can immediately release the female and they should begin spawning right away. Again, keep watch in case things get to rough in there.
The male will lead the female to the nest for her inspection, if she's not pleased she will destroy it.If she is happy with it she will swim around underneath it,head down. Don't be surprised if they get pretty brutal during the spawning, the occasional nip and rip is perfectly natural. The male will flip the female over and wrap himself around her and squeeze, eggs will fall from her and she will float in a paralized state for a few seconds. Again, don't be scared this is all normal. The male will fertilize the eggs during the wrap and as they fall he'll pick them up and place them in his nest. Then they will wrap again,more eggs,more paralysis and so on. Occasionally the female will assist the male in picking up the eggs.
You'll know when they're done because the female betta will be hiding in the plants or off on the other side of the tank. You must remove her swiftly after the spawning! The male will indeed kill her if you do not so you really have to pay close attention at this point.
Careful getting her out, don't chase her around the tank willy nilly with a net, just gently scoop her out with a cup in order to not ruin the fathers nest. Now cover the tank with a towel and leave him be.
Dad will watch closely over the eggs for the next few days. Don't feed him at this time,it may trigger his appetite and right now he's not hungry anyway, he's got work to do. The male will sit diligently watching his nest. He may cruise the tank from time to time,checking for stray eggs or predators,be careful not to let him see you, he will eat the eggs if he feels threatened.
After 24 hours you will notice little baby fry falling from the nest like rain, now's Dads time to shine! For the next 48 hours he will catch the babies,day and night, and put them back in the nest. That's why it is important to leave some dim lighting for him at night. If he gives up quickly or turns on the fry and you notice him eating them, go ahead and take him out and lower your water level to about 3". The fry will feed off their egg sacks for 2-3 days,these are attached to their belly and they're rather heavy,that's what causes the fry to fall.
For 2 days he will watch over the fry, on the 2nd day they should go from this position l to this position _ and swimming on their own vertically, remove dad now because he's hungry and those fry are starting to look delicious!
You should already have his tank set up and ready for him.
Ok, the male is gone, happily munching on some bloodworms back in his own tank, now it's time to give the babies their first meal. Give them a small portion of microworms to start with, watch them eat because there is nothing like watching them devour their first food. They should be happy with the worms for a week or so but you really need to get your brine shrimp hatchery started ASAP. They'll need a meatier food,like bbs, after the first week. Feed them at LEAST twice a day, they're the hungriest little things you'll ever meet.
Now's the fun part, keeping the fry tank clean. Small,partial water changes are essential. Use a long piece of airline tubing to syphon the tank. Use a clear or white bucket so that any sucked up fry are easy to recover, just scoop them up with a cup and dump them back in the tank. You should cover the tank with saran wrap for the first 6 weeks, this keeps the surface air humid and assists the development of the labyinth organ.
At about 4 to 6 weeks they will need to move to a larger grow out tank. At about 2 to 2 1/2 months you'll be able to sex them, the males will begin bullying each other so it's time to bust out the jars.
There ya have it, it's a lot of work but nothing compares to baby bettas
*There's always new things to learn when it comes to spawning and breeding bettas and nothing is ever 'by the book'.
It's an exciting and fun hobby and I wish you the best of luck.