Cryptocoryne parva
Cryptocoryne parva
Also known asCrypt parva · Dwarf crypt
Water parameters
Light and nutrients
Substrate type: nutrient rich. Propagation: runners.
Substrate compatibility
| Substrate | pH effect | Nutrient load |
|---|---|---|
| Aquasoil (ADA Amazonia) | lowers pH | very high |
| Mineralized clay substrate (Seachem Fluorite) | neutral / inert | moderate |
| Inert sand (Pool filter sand) | neutral / inert | none |
With fish
Origin and habitat
Native to central Sri Lanka, in shallow, clear, gravelly streams of the island's wet zone. Cryptocoryne parva de Wit, family Araceae, is the smallest species in the genus, a tiny rosette only about 5–8 cm tall with narrow, stiff, bright-green leaves 3–6 cm long. That grass-like miniature size makes it one of very few Cryptocorynes usable as a foreground carpet. Unusually for the genus, it changes little between emersed and submersed growth, the underwater leaves closely matching the emersed ones. It is also the slowest-growing crypt in common cultivation, which is saying something in a genus already known for taking its time.
Care notes
The most patience-testing foreground plant in the hobby. Growth is glacial: a mother plant adds maybe a leaf every couple of weeks, and a planted group takes six to twelve months without CO2 to merge into a carpet, or four to six months with CO2 and strong light. Unlike most crypts, parva actually wants more light, medium to high, around 40 PAR or more, because its tiny leaves capture so little, though too much light can still cause melt. Root nutrition is non-negotiable for this heavy root feeder: use a nutrient-rich substrate and refresh root tabs every few months. Plant individual specimens 2–3 cm apart and wait for the slow runners, which throw only one or two daughter plants every few weeks, to close the gaps; many aquascapers simply buy a lot of tissue-culture cups for instant coverage rather than waiting. CO2 helps but does not transform the pace. Crypt melt during the move from emersed nursery growth to submersed is common and especially galling here, since every lost leaf is weeks of progress, so leave the roots in and wait. It is not for impatient keepers, but once established it makes a natural, near-maintenance-free grassy foreground. It is an ornamental rosette, not a crop, so it is unsuited to media-bed aquaponics or hydroponics.