This plants slumps a little in low light/no co2/low ferts but can still survive. When the plant is in high light/high co2/high ferts it wants to stand straight up reaching for the light and some of the older leaves seem to turn shades of red. Very easy plant to grow, the first one I bought got about 4-5 hours of light per day with the 1 capfull of that API liquid fert a week in a 29 gallon tank.
I love this plant. Bought one about a month ago and it's growing fairly quick in my 20 with high light/co2/ferts. If you trim the bigger leaves at the stem, tons of little ones will start to sprout a few days after.
I have this plant growing in two tanks with two set ups. Tank #1 is 125g T5HO 4" from surface soil capped with sand, compressed co2 daily ei. This plant grows low to the substrate and spreads out to the side. I have also noticed that every few weeks it seems to shed a bunch of healthy looking leaves and not really look thinned out. Still a very bushy plant. Tank #2 is 55g turtle paludarium 6500k cfl 18" from surface soil capped with sand no ferts/co2. The plant glows very tall with larger leaves, the ones on top floating. Very bright green with many runners. Branches are spaced apart making it look like a small tree. In my experience not eaten by turtles.
I planted one from the lfs. It was ok for a week. Moved it and 3 days later it melted like a Popsicle in July. Then it sprouted 4 new baby leaves overnight. Don't toss this plant if it melts- it might just have indigestion.