Yep, there are a few different varieties/sizes of Duckweed within the hobby.
People tend to harp on the smaller varieties because it gets everywhere but I love it in shrimp tanks. Added security of sucking up nitrate.
Salvinia needs decent lighting and typically needs a good amount of nutrients in the water column. Not sure how I'm making it work in this particular tank but it continues to grow.
It looks amazing, but are there different larger leaved varieties around?
I feel like salvinia stinks... It didn't take off the last time I had it.
How about red root floaters? Never tried those