ID stem plant please

[Oli]

Pic attached (pinkish one)

 

[connorlindeman]

I do not think that is an aquatic plant.
How long has it been in your aquarium?

 

[MattW]

hygrophila polysperma rosanervig

 

[CassCats]

Very nutritionally deficient rosanervig. Leaves look curled and stunted. They like regular fertilizer and may require extra potassium if you're lacking