O.k. , yes I.M.E it grows just as well [ and fast ] as it will placed on rocks or driftwood . The only problem with floating them is that leaves don't always grow as nice to look at [ some of my plants are ball shaped ]. If that doesn't bother you they'll be fine almost any where [ in the tank ] as long as the water is changed regularly . Also , anubias nana do o.k floating , i.m.e they grow slower , than they will attached to something .