I agree with Try-na. Hornwort and foxtail are the same thing--ceratophyllum. The pale or discolored tips happen when there is a major change in lighting as in a disruption from the grower to the store, or the store to your tank. It won't root in the substrate as it is really a floating (or barely rooted) plant, but can be poked in to make a nice background clump. Some people hate it because it can be messy as it drops its needle-like leaves, but I like it for my goldfish to nibble on and to shade the substrate (as a floater) and reduce algae in the coldwater tank. I also use it to shelter fry in the tropical tank.