What the heck, a lady at the pet store said it was Java fern . I don’t have substrate but I do have marbles? I have to get fertilized substrate now don’t I The second photo is of the stems breaking.The plants I can see (barely) in the first photo are not Java Fern but swords. These have a root mass that should be buried inn the substrate. In a bright area too. Not sure what the second photo is.
Since the plants are not "planted," can you give a better photo so we can see the structure?
And, a piece of advice almost every member here will second...never listen to advice from a fish store.
Members are saying it’s Amazon sword, which I think it is as well now that I am seeing the structure. It did come from one plant but was separated in 3.Now I am seeing what I think is a house plant. It most assuredly is not Java Fern though. Another member is bound to know. These plants sometimes last for a few months, but can suddenly rot and foul the water. Are you sure all the leaves are from the one crown of the plant? It looks like a very long leaf and much shorter leaves.