Mine is tied to slate. Like it is in my ten gallon. I'm pretty sure the concensus is that it will grow healthier/fuller if it is attached to something. It is also easier to see it's progress when you can scale it up to height. Here's a pic of the moss in my ten gallon that I just applied to slate about a month ago. It has had some crazy growth. The last pics are what it looked like at the end of December.
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