I think I've got a problem. So I want to carpet the bottom of my tank with Java moss. I know it will grow all over everything and I'm OK with that. I might try and keep it off the drift wood but that's optional. So my issue is this. I have a sand substrate and I want the moss to follow the contours of the sand. Do I need to anchor the moss down or can I just chuck it in and let it grow leave the trimmings lay around and wait for it to thicken?
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