I rigged up some egg crate and affixed it to the trim at the top of my tank. If you keep the leaves above the water, the roots will grow down until they hit your substrate. There are a few posts in the algae/marine plants forums about people using them in a remote dsb. Let me stress again - if anyone has some they wanna get rid of, PLEASE hook this brotha' up!!!
I LOVED the look of their crown peeking outta my tank...