Is there some type of netting material I can use to keep substrate shaped the way I want it for a 29 g Biocube scape I'm working on? I've never used anything but stones to do this, but to keep sharper slopes and to shape the loose substrate (turface pro league gray) the way I want I need something to hold the substrate better that won't interfere with carpet plant growth and won't be visible once the growth is in.