All species

Salvinia

Salvinia auriculata

Also called floating fern.

Doubles weekly and will shade everything under it. Thin it out.

What it needs

Grows to
3 cm
Smallest sensible tank
20 L, at least 30 cm long
Temperature
20 to 28 °C
pH
6 to 7.5
Hardness
2 to 15 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 salvinia fits the tank you have.