Get some Fanwort as a floating plant (also known as "Frill Plant" at Petsmart). I'm a huge fan of fanwort. hehe. It's similar to hornwort but I think it looks a lot nicer. It's very pretty and delicate-looking. Bright green. My female loves weaving over and under the stems. You could also tie it to a rock or weigh it down some other way and it looks nice. Unlike hornwort, you can plant it in the substrate, but mine didn't start growing roots until I had really good lighting, so I find weighing it down or letting it float is best. It tends to shed a lot, though, but it's easy enough to vacuum it up with a gravel vac.
Last edited by OrangeAugust; 12-18-2012 at 10:24 AM.