a sand substrate for such a scape (anubias nana & xmas moss) is fine, but u will still have to dose some fertilisers in the long run.
for plants such as anubias nana (With rhizomes), u should tie them onto rocks/driftwoods and refrain from burying the rhizomes and roots in the substrate. burying will cause it to rot, they need some degree of water flow to those parts!
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