I have 2 Java Fern's in my tank and noticed that they are sprouting roots from the underside of their leaves. I read that these are not supposed to be buried in the sand, roots should be free to root in wood, etc. I don't have any wood in my tank now, would it be a good idea to add some for the fern to root into? What are my options here? I don't want a big piece of wood at this point, no space. Also, should the roots coming from the leaves be allowed to attach to something? Seems odd to me, some advice needed.