I used latch hook type sheets (called Craft-It from walmart) to make mine, though there are other plastic meshes available. I chopped up the moss and layered it thinky on the craft-it. You would anchor some suction cups in before closing the mesh. Then its sewn shut with fishing line and put in your tank. I used two seperate pieces as it was easier to cut to fit this way, though others have used a single piece folded in half. I also didn't use suction cups as mine wasin a shrimp tank and no danger to fish. You would want to use them to prevent fish from getting trapped. After its installed, you just wait for it to grow.