It may just take some time growing it out and seeing how it matures before a positive ID can be made. Either way, it's a neat looking plant, and well worth keeping....until it grows into a giant squid and eats your aquarium.
I do not think that it is a Eichornia species. Not sure if I can do this, borrowed this picture from Mimbon on their exploration of Sulawesi. The circled plant growing amonst the Eriocaulon is the plant that I have.
Anyone? Able to place within a family, will be of great help.