Just a note: IMHO water roots like that occur when a plant that prefers to root feed does not have its feet wet yet. Let the plant put down some solid ground roots, trim the hanging water roots once it gets happy, and it should eventually quit putting out the hanging water roots. IME water roots like you're seeing only occur when a plant doesn't have its feet in the soil solidly yet. Once it gets happy and puts its feet down, it will likely quit putting out those hangers.