It looks really nice. :)
The wisteria will float for.. well, I had a really big stem floating for three months or so, before the roots got so big I had to plant it. It's happy now, planted in the gravel and I have a new floating piece, also putting down roots.
You may even find, depending on what sort of lights you have, that it does -better- floating than planted..
I like how you've got your tank set up. Don't be afraid to try new plants! Just google them first, see what they need/how easy they are. Usually red plants are harder to keep (they like lots of light). There's exceptions, of course.
I just got a lovely bunch of maxilla - I've never tried this plant before! And banana plants, too. It's exciting trying new ones out, and if they die.. well, I have learned something about that particular tank and what I can grow in it.
If the leaves are wilting and look soggy and clear or unhealthy, pull them off and throw them away. If they're green (wisteria), let them float! They'll put down roots. :)
Your betta looks just like my first betta, Sid. He's lovely!
Watch out for that spike pink plant.. it may be too sharp/prickly for his tail..