Read some intersting discussion earlier today about folks setting up a refuge and pupulating it without macro's, but instead LR rubble and Pom Pom Xenia. The claim is that the Xenia have a NO3/NO4 uptake that is up to 20 times higher than most macros.
Alledgedly reports of fantastic growth rates provided cal. and alk levels are maintained, if they are taking up that much NO3/4 I would guess it would work.
Seems logical to some extent, as the only way we can keep from killing them alive is to keep nitrates around 5-10ppm in the display tank.
Not sure it'd be something I'd want to try, I like Xenia just fine but not sure I want a whole fuge full, though if any LFS was to give me a decent credit rate for them it might be worth it.
Anyone else heard of or tried this method?