Marble Queen Sword
Echinodorus cordifolius 'Marble Queen'
Also sold as Radican Marble Queen Sword · E. cordifolius 'Marble Queen' · Marble Queen
Marble Queen Sword (Echinodorus cordifolius 'Marble Queen') is a rosette plant for the background, growing to about 40 cm (15.7 in) at a fast pace. It wants 68–82°F (20–28°C), low light and no CO₂, and counts as an easy plant to keep alive.
Try it in a tank
Put Marble Queen Sword in a 3D tank at your size and see how it sits with everything else. Free with an account.
At a glance
| Type | Rosette plant |
|---|---|
| Light | LowThe least light it survives in, not the light it looks best in. |
| CO₂ | Not neededWhether it survives without added CO₂ — not whether CO₂ would help it grow faster. |
| Difficulty | Easy |
| Temperature | 68–82°F (20–28°C) |
| Max height | 40 cm (15.7 in)Grown submersed, left to mature, never trimmed. |
| Growth rate | Fast |
| Placement | planted in the background |
| pH | 6–7.5 |
Before it goes in
- Marble Queen Sword lives under a plain low-light LED — it does not need a planted-tank lamp to survive.
- It grows without CO₂.
- It feeds through its roots, so in plain sand or gravel it needs root tabs; in an aquasoil it does not.
- At about 40 cm (15.7 in) it belongs behind everything shorter — planted at the front it hides the rest of the scape and shades it.
- Its leaves are medium: Goldfish, Electric Yellow Lab and Colombian Ramshorn Snail will eat it.
Marble Queen Sword: care and setup
Can it grow without CO₂?
Yes. Marble Queen Sword does not need CO₂ at all.
How much light does it need?
Low light is enough — and that is the survival line, not the “it looks better” line.
How big does it get?
About 40 cm (15.7 in) tall when it is mature and untrimmed, growing fast, after roughly 3 weeks to root in.
Will my fish eat it?
Its leaves are medium, so some will: Goldfish, Electric Yellow Lab and Colombian Ramshorn Snail.
What it goes with
- Plants that run on the same light and CO₂, so they can share a tank without one of them being the odd one out: Hygrophila corymbosa 'Siamensis', Water Sprite, Anubias nana 'Petite' and Frogbit.
- Animals that share its temperature range and will not eat or uproot it: Betta, Cherry Shrimp, Angelfish and Bristlenose Pleco.
Often compared with
| Marble Queen Sword | Ozelot Sword | Amazon Sword | |
|---|---|---|---|
| Light | Low | Low | Low |
| CO₂ | Not needed | Not needed | Not needed |
| Max height | 40 cm | 40 cm | 50 cm |
| Difficulty | Easy | Easy | Easy |