I find fissidens quite easy to grow... only thing is they acclimate slowly and are naturally very slow growers so you need extra patience. Not sure why they are classified as advanced plants though, but in my experience i've managed to grow them in quite a wide variety of conditions, even in outdoor containers with temperatures hitting >32°C.
You could also glue the fissidens on the rocks, but i find that it tends to get abit messy as the cured glue residue will show though the thin delicate moss fronds. If possible, its still better and neater to tie them on (some people also use a hair net to wrap them on), the fissidens will attach to the rock after a few weeks. Do make sure that the rocks you use have rough or porous surfaces to allow the fissidens to grip on securely.
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