A lifetime ago and half a continent away I had a dwarf version of Vallisneria in a tank with some guppies. It never grew taller than about 15-20 cm. Now that I have a tank again, I cannot find this Val. Does anybody have experience with a dwarf cultivar? I'd really like to find one. Tropica has the following: "Vallisneria 'Mini Twister' but the only retailer I could find (in Vancouver, BC) says that Tropica doesn't export to the US. Help!