Hi Steven,
I never had the chance to set up a vivarium but I do keep various mosses. One of the most hardy mosses I've ever found is Amblystegium serpens. It's a native moss in Europe and grows well submers and emerse. In nature you will find it on lawns, on wood and sometimes even submersed. Emerse it grows very short and it's rather small. It's nothing special like the native European Thuidium tamariscinum which I never kept yet.
If you are intested in Amblystegium serpens, send me a PM. I have more than enough of it in my tanks.
regards
Robert








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