Yeah it is super cool to watch the Bettas going in and around the roots. My tank wasn't 'deep' enough to have the roots grow down the back but that would be a really neat thing to do. What is the other plant? Where do you find it? Is it a type of seaweed? And have you ever tried to grow bamboo in a container with Bettas?
I'm usually on the lookout for unique containers that are big enough to house a Betta. Am not a fan at all of the small tiny little homes in fancy glasses etc. but I do like the larger vases where you can put in 'ornaments' as well as the Betta. Today at a garage sale I was looking at some really old ceramic flamingos and thinking - red Betta, pink Flamingos, red stones..........but didn't, in the end, buy 'em.
Ideas are always welcome!