You could also consider some Marsilea sp. Here's a link to aquatica that also shows minutea (sp?) at the bottom.
http://www.floridadriftwood.com/product.asp?3=246
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46g bf, XP3 w/ vertical spray bar, CO2 w/ SMS122 & diffuser,100% Flourite, 96w+55w cf AHS, AGA Member
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