08-16-2010, 03:47 PM
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It is sometimes possible to divide a large sword, but in your case this would not be of much help because the "two" plants will grow just as large. Lisa is correct, if this is the commonly-available sword Echinodorus bleherae, it generally (in my experience) grows to the tank size. I have dozens of daughter plants (my parent plants exploded with inflorescences this past Spring) some of which are in a 10g and 20g just to "grow" a bit, and they are fine for the present, but I know that at some point they will "take off."
A nice smaller sword for a 10g is the Dwarf Sword, Echinodorus parviflorus "Tropica" if you can find it. Lisa got some of these for fore-ground plants in her 120g, and I have them the same in my 115g. But as they do not exceed maybe 6 inches height, they are ideal in 10g (and even 5g). Plus the pygmy chain sword Echinodorus tenellus which is a nice contrast with light green ribbon leaves. Dwarf sword has very dark green and "hammered" leaves. Another good sword is Echinodorus amazonicus, which is almost identical to E. bleherae but narrower leaves and shorter. One of these in a 10g, with maybe 2 Dwarf Swords and a chain sword (as the name suggests, they send out runners with daughter plants fast once settled) would be nice.
Edit: you posted the photos after I saved this response; that is E. bleherae.