Which nutrient is deficient?

[oqs]

I notice one of my plant is growing out new leaves that are crumpled and curled badly, similar to a "@". hope to find out what kind of nutrient is lacking here. can anyone help?

[Simon]

wat plant r u referring u?

[oqs]

it's a stem plant with long and rather thin leaves. bought from ah pek but dunno the scientific name. any nutrient defiecieny symptoms that are like what i described?

added picture of the plant:

[wks]

Hmmm... looks like hygrophila polysperma.

[DEA]

could be salicifolia too
i don't recall polysperma having such long leaves which curl up
but my lacustris did
yours are too thick to be h. lacustris tho

[vinz]

Aqua Botanics Problem Diagnosis
Nutrients Deficiency
The Krib Nutrients Deficiency Chart