That's a much better photo, and would be perfect for ID purposes if it also displayed a coin or a palm; for scale-reference.
I still think it is P. pusillus, or something closely related - especially if the leaves are 1.5-2" in length.
However, I don't recall seeing this species grow in "balled masses", as shown in your initial photos. In fact, based on those photos alone, I would've likely guessed it as an Eleocharis spp.
Here's are some photos of P. pusillus.
Edit: now that I look at your photo more closely, I can tell that you have a toothpick next to the plant. I didn't realize that it was a toothpick at first glance.
