I bought a bunch of this plant at Petsmart that they called "Bush Plant". It looks very similar to Hornwort, but more fine. I have only seen Anacharis in photos so I can't tell if that's what it is. Is Anacharis the only other aquatic plant that looks similar to Hornwort?
Anyway, I put a bunch of sprigs of this "bush plant" floating on the top of Lila's tank and she loves it! It's so cute to watch her weaving over and under and in between. It's better than the hornwort because it's less dense. She could swim around a few sprigs of hornwort in her tank, but she couldn't swim through and under and over like she can with this stuff.