03-17-2011, 11:27 AM
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Any of the Echinodorus genus (swords) will be fine. You mention having one, probably the common sword Echinodorus bleherae, a trio of 3 of these would be nice in a 4-foot 55g tank, spaced unevenly for better effect. They will get large in time, within a few months, but this is a lovely plant. The pygmy chain sword is another for the foreground. And the Dwarf Sword. All are in our profiles, click on the shaded names.
Crypts are nice but can be fussy, so as you said "easy" I would avoid crypts. Brazilian Pennywort is an easy stem plant, and it looks lovely floating, which your angels will love; they are fish that occur in dim light waters and prefer overhead shading. Also in our profiles.