Eleocharis sp. 'Belém' is the original trade name of the miniature spike-rush now usually listed as Eleocharis sp. 'Mini', which is also referred to as E. acicularis 'Mini' or E. pusilla.12 Whether it really comes from the surroundings of the Brazilian city of Belém, as the name suggests, has not been established.12 A Danish aquatic plant nursery was the first to bring it onto the European market, around 2012.1
Its very thin, light green culms often bend sideways or downwards; the stated height is about 3–7 cm.12 It suits the foreground and nano aquariums as a ground cover because its runners, which mostly grow underground, soon form a dense, lawn-like carpet.12 Above all it needs good light.2 A nutrient-rich substrate and added CO₂ are recommended and markedly promote growth, but it can also be kept without CO₂.12
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