That is an amazing set up you have going on, just try to be patient because it will be worth it in the long run. Moss or anubias would be great choice either way. As SpecGrrl pointed out, the potential danger of damage is priority, and should be addressed before putting betta in. By looking at your setup, this isn't your first rodeo, so keep up the hard work! Keep us posted
The worst defeat in the world, is when you give up.