For a few weeks before you are ready to spawn your pair, you can keep them
in adjacent jars. This will allow them to "get to know" each other. Sometimes
the male will flare and display for the female or even start building a nest.
This is a good indication he's interested in her! She may also notice him and
swim nearby, flexing her little fins and wiggle her little tail and say, "Hey!
Aren't I pretty?" She may also display vertical (not horizontal, which are
associated with fear and stress)bars along her body. They indicate she is
interested in spawning. These bars are only visible on dark body bettas, so
you won't see them on an opaque.
Once your tank is setup and ready to go, you can introduce the pair. I usually
float both the male and female for about 30 minutes side by side in the tank.
Pour a small amount of the tank water into their cup and let them float for
another half hour. Then I release the male to swim freely in the tank.
Typically, he'll notice the styrofoam cup right away and begin making his
bubble nest. The female is then released into the hurricane glass so that she
is protected from the male. In between making his beautiful bubble nest, he
will swim over to the female, flirt and showing her how pretty he is. She
might flirt back, be shy and timid, or even flare back at him. As long as
she's not flaring excessively and she's not displaying horizontal stripes,
then you're doing great!

Male displaying for the female. I think she's interested!
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