Subwassertang is one of the toughest mosses/liverworts to attach. Its brittle so tying it loosely with cotton thread works good. Even then it doesnt "Attach" real well. It usually gets bushy, shades the bottom, the bottom does off, and the rest hovers around the driftwood. It likes really soft driftwood that plecos would make short work of. Tying loosely seems to be the best bet. If you tie it too tight it crunches the plant and it starts to die right where you want it to attach. Fortunately its not a real finicky grower so you have several tries at it. Youll also get better at it the more times you do it. Superglue doesnt work well because you have to use ALOT of glue, and it doesnt last long before it floats up. Mesh and netting are difficult to use too because it has a hard time growing through it and it compresses it/shades it too much.