Although I've never done it personally, the display tank at Old Town Aquarium in Chicago once had a foreground composed of horizontally growing Hygrophila difformis. Looked nice. I liked it. 
Just try planting the stems horizontally across the substrate. Don't let it get shaded, and it should do well.
The change in Hygrophila difformis is normal. Just means it's getting big, fat, and healthy.
Carlos
Just try planting the stems horizontally across the substrate. Don't let it get shaded, and it should do well.
The change in Hygrophila difformis is normal. Just means it's getting big, fat, and healthy.
Carlos