Stem plants that can grow floating?

[chickennublet]

Thinking of getting some nice stem plants that can grow free floating, like water sprite or something. My HOB filter probably won't work well with true floating plants until I can set up some sort of corral to trap them in or something.

Anyone have any recommendations and where I can get this type?

[torque6]

foxtail, hornwort, watersprite will do.