Join Date: Mar 2012
Location: Gainesville, Florida
You definitely have some algae in there which is something rotala rotundifolia doesn't like. Mine had small shrunken leaves like that when I had an really bad thread algae outbreak. With that being said you should consider your lighting and fert schedule.
What kind of lighting are you using (the wattage and the brand/type), how far from the substrate is it, what is your fert regiment and what dare you doing for CO2?