Plant Id

[guppi]

My link
Can anyone id this plant for me and tell me the best way to plant them, they came tied together in sponge can't see any roots. also are they easy to keep.
Thanks Guppi

 

[Ben M]

Hi, that plant is Ceratophyllum demersum (aka hornwort). It is an easy plant to grow, but doesn't grow roots.

cheers