08-11-2010, 01:32 PM
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Brad, Amazon sword will be perfect, whatever species it is. Most likely it is Echinodorus bleherae [may be spelled bleheri]. In my experience it grows to the tank; the bigger the tank, the larger (taller) it will get. Lovely plant.
The Spathiphyllum wallisii will work; it is not a true aquatic, but Hiscock has it listed in his aquatic plants section and says it will survive submerged and be healthy for months and sometimes years. This is actually the common house plant "Peace Lily."
The Ophiopogon japonicus as I mentioned earlier is also not a true aquatic but does do well submerged. I have seen these in aquaria many times, I had one years ago, can't remember how it did, but Hiscock says it does well in most aquaria. It is quite a unique plant, different from most true aquatics, so worth having.