Duckweed
Lemna minor
Also called lemna.
You will never be rid of it. Add it on purpose or not at all.
What it needs
- Grows to
- 1 cm
- Smallest sensible tank
- 20 L, at least 30 cm long
- Temperature
- 18 to 30 °C
- pH
- 6 to 8
- Hardness
- 2 to 20 dGH
- Grown
- floating at the surface, never pushed under
- How hard
- easy
These are the figures the stocking advice is built on. Make a room and it will tell you whether a duckweed fits the tank you have.