Stoffels Cryptocoryne x willisii 'Lucens' (small)
Cryptocoryne x willisii “Lucens” is a natural hybrid variety (e.g. of Cryptocoryne parva, C. beckettii, etc.) with thin, lanceolate, shiny green leaves. Relatedly, it is often confused with Cryptocoryne nevillii – but “Lucens” as it is known in the hobby, differs in having narrower and longer leaves. It is hardy and small to medium in size. It originates from the river banks around the Kandy area in the central plateau of Sri Lanka.
Placement & Growth:
Suitable for foreground and midground, even in small (nano) aquariums
Grows in practical rosettes with runners
Does not like to be moved — avoid planting and repotting frequently, as it may suffer from "crypt melt"
Easy care — very hardy and suitable for beginners
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Low to medium light tolerance — can grow well without bright light
In medium light it has a more vibrant green, better appearance and faster growth, while in low light it has a light shade and slower growth
Substrates & Temperature:
Prefers nutritious substrates — even without CO2, but the use of nutrient-rich soil and root-tabs enhances growth
Ideal temperature: about 20–28 °C (or 22–28 °C according to tissue-culture sources)
pH & Water Hardness:
pH: ~6.0–7.5
Soft to moderately hard water
CO2 & Nutrients:
CO2 is not necessary, but improves faster and more vigorous growth in more intense conditions
Nutrients via substrate or root-tabs help significantly
Maintenance:
Remove fallen/dead leaves regularly for best appearance and health
Perform regular water changes (e.g. 20–30% weekly) to maintain a clean and stable environment
Gradual changes (light, water, nutrients) help: avoid drastic changes to avoid “Melting”
Additional organisms such as algae-eating shrimps/fish help with algae control
Conclusion:
Cryptocoryne x willisii ‘Lucens’ is an ideal choice for both beginners and experienced aquarists. It offers a natural, grassy green carpet or medium-height plant, without requiring any special techniques or conditions. Ideal for low to moderate lighting, without mandatory CO2, but with good substrates and a stable environment, it will flourish and decorate your aquarium with natural beauty and simplicity.
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