Riccia
A rootless floating liverwort that can be tied down to form a bright green pearling lawn — and that will float away the moment it is not.
Requirements
- Scientific name
- Riccia fluitans
- Family
- Ricciaceae
- Light
- Medium to high
- CO₂
- Strongly beneficial
- Nutrients
- moderate
- Growth rate
- Fast
- Placement
- Flexible
- Feeding
- water column
- Temperature
- 18–28 °C
- pH
- 6–7.5
- Hardness
- 1–15 °dGH
Identity
- Common name
- Riccia
- Scientific name
- Riccia fluitans
- Family
- Ricciaceae
- Also sold as
- crystalwort
How to plant it
The commonest way to kill an aquarium plant is to install it wrongly. This is the first thing to get right.
Float on the surface
Nutrition reaches this plant mainly through the water column, so liquid fertiliser matters more than substrate nutrition.
Growing conditions
| Input | Requirement | Notes |
|---|---|---|
| Light | Medium to high | Match plants to the light you have rather than raising light to suit the plant — that grows algae. |
| CO₂ | Strongly beneficial | Not a requirement, though growth is faster with it. |
| Nutrients | moderate | Dose a complete liquid fertiliser. |
| Temperature | 18–28 °C | |
| pH | 6–7.5 | |
| Hardness | 1–15 °dGH | |
| Growth rate | Fast |
Propagation
Divide the mass; it grows from any fragment.
Common problems
- floats away when untied
- inner layer dies off
- traps detritus
Work from the observation: melting, yellow leaves, holes in leaves and poor growth.
Fish and invertebrate compatibility
- Resists grazing
- poor
- Resists digging
- excellent
Worth knowing
- Has no roots and no attachment organs. Submerged use requires mesh or thread, and re-tying every few months as the inner layer dies back.
Evidence
| Claim | Value | Evidence type | Confidence | Source |
|---|---|---|---|---|
| scientific name | Riccia fluitans | Observed / measured | high confidence | Plants of the World Online |
| temperature | 18–28 °C | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
| light requirement | medium-to-high | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
| co2 requirement | strongly-beneficial | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
| growth rate | fast | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
| placement | any | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
| ph | 6–7.5 pH | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
| general hardness | 1–15 °dGH | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
Why we say this
What each figure on this page rests on, and how far that is from being independently established.
Every figure on this page has a provenance. Open any claim to see what AquariumHQ holds for it, which sources say what, and what a claim of that kind actually needs. Different claims need different evidence: an accepted scientific name is settled by one authority, while a legal restriction needs a current primary instrument. A single source is often the right answer rather than a thin one. Light and CO2 categories are aquarium conventions rather than measurements, and are labelled as such — AquariumHQ has taken no PAR readings and does not publish figures it has not taken.
scientific nameAquariumHQ's own position, externally checkableLimited evidence — treat with caution.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: accepted botanical name — 1 authoritative source in an appropriate context. This class needs 1 independent origin of at least primary-compilation authority, and 0 are held.
What would improve this: Go and read a source. This is reachable and has not been reached.
temperatureAquariumHQ's own position, externally checkableAquariumHQ's own position, derived from evidenced inputs.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: how to grow the plant — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Go and read a source. This is reachable and has not been reached.
light requirementAquariumHQ's judgement — no authority publishes thisAquariumHQ's own position, derived from evidenced inputs.
No external authority publishes this. The rationale carries the reasoning.
What this kind of claim needs: how to grow the plant — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Keep the rationale current. There is no source to find.
co2 requirementAquariumHQ's judgement — no authority publishes thisAquariumHQ's own position, derived from evidenced inputs.
No external authority publishes this. The rationale carries the reasoning.
What this kind of claim needs: how to grow the plant — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Keep the rationale current. There is no source to find.
growth rateAquariumHQ's judgement — no authority publishes thisAquariumHQ's own position, derived from evidenced inputs.
No external authority publishes this. The rationale carries the reasoning.
What this kind of claim needs: how to grow the plant — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Keep the rationale current. There is no source to find.
placementAquariumHQ's judgement — no authority publishes thisAquariumHQ's own position, derived from evidenced inputs.
No external authority publishes this. The rationale carries the reasoning.
What this kind of claim needs: how to grow the plant — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Keep the rationale current. There is no source to find.
phAquariumHQ's own position, externally checkableAquariumHQ's own position, derived from evidenced inputs.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: how to grow the plant — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Go and read a source. This is reachable and has not been reached.
general hardnessAquariumHQ's own position, externally checkableAquariumHQ's own position, derived from evidenced inputs.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: how to grow the plant — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Go and read a source. This is reachable and has not been reached.