My LFS gave me one of these guys after she came in in a shrimp order and was munching on the merch. I was planning on no fish, just coral in my tank, and so I don't have a ton of rock in it at the moment. I was wondering if it is a possible thing to put a smaller bed of some sort of macro in the tank on one half to mimic the sea-grass beds that her species is from. Maybe ulva, or one of the taller growing gracilaria species? Does that sound like a doable idea at all? What kind do you suppose would work best in a 20 long as a species that would stay manageable, and more upright? Tank has 18 LEDs from Rapid on it.