Actually, supposedly there is a submersed variant of Riccia, some people claim they have been able to grow Riccia without attaching it, but I have never been able to do it. Riccia is a floating, rootless plant that consists of short strands that sort of loosely interlock with each other. People started attaching it to wood or rock after Japanese aquarium photographer Amano did it in his books. You attach it with any sort of nylon or synthetic thread. Cotton thread dissolves just like fresh-newby said. You have to keep it trimmed close to the netting or clumps of it will break off and float. The thread also eventually comes loose, so you have to constantly re-tie it. For this reason many peope who try this get tired of it eventually.
There are other ways to use it. You can sandwich it between sheets of plastic mesh and weight it down with rocks to create a Riccia lawn. People have also used stainless steel grids that are heavy enough alone to sit on top of the gravel. Whatever you do with it, it requires a good amount of maitenance.
Robert Paul Hudson
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