I see all the time how to make a moss wall, but will this work on the gravel? I would love to have a carpet of java moss, but right now mine is just i a ball in my tank. I do not know how to keep it down so it grows along the subtrate. I tried tying it to my fake log, but it just never adhered to it. it all ended up in my filters. I need ideas on what to with with my java moss. thanks