So I have narrowed it down to these two and I am thinking of doing both. Visibility of the whole tank isn't an issue. I want to make it thick by using background plants that grow large as center and foreground plants. I Asked here once before for plant recommendations that can use sand as a substrate without fertilizers, low lightning, warm, and no Co2. So I have found my best options may be Hornwort and Hygrophila. My question is, since black ghosts are a skin fish, would Hornwort be too dangerous for them as it could cut them? Or are they less delicate that I expect them to be? Is there a better large growing plant that could simulate a sort of jungle seaweed feel while being within the parameters I have?