yes, I thought it looked very much like Rotala macandra myself, but wanted to see if anyone else thought so as well

When I followed these stems down they were growing from the Rotala sp. 'butterfly' mass I had growing in the tank.
soulcommited, the stunting initially occured when I did not raise up my macro dosing in the tank. I have an automated system going, as the plant density greatly increased, I did not change my dosing amounts until recently. I also had my Pogostemon stellatus stunting in the tank, which recovered nicely when I increased the dosing amounts.
current parameters:
CO2 is continuous to bring it to over 30ppm (yellow-green on a dKH 4 standard in drop checker)
lighting is 192 watts of compact flourescent in a 55 galllon.