if you want something simple to keep, go with java, taiwan or spiky/peacock moss. these require no fert/co2/chiller to grow nice and well. if you want something that looks really good, and you have colder water or a fert/co2 regime, try us fissiden...be warned that fissiden does grow relatively slowly even with good conditions as compared to other mosses.
my personal preference is for spiky moss or us fissiden
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