I'm looking for a nice moss that is able to cover a piece of drift wood exposed to high light, without getting stringy. I have tried this with java moss, but it just grew upwards and stringy, no matter what I did to stop it. Plus, I don't like how invasive java moss is. It seems like I spend a ridiculous amount of time picking it out of the gravel. Does anyone have any experience with other mosses that have the properties im looking for? Thanks.