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Some of the most striking, I have noticed...

Micrantemum umbrosum:

Mild nitrate deficiency: smaller leaves, stunting
Severe nitrate deficiency: entire plant turns pale and transparent

Didiplis diandra:

Mild Fe deficiency: lanky, green growth with long internodes
Severe Fe deficiency: white, crinkled new growth with brown spots (necrosis)

Rotala macrandra:

High nitrate, low phosphate: longer internodes, more orange color with yellow splotches
Low nitrate, high phosphate: shorter internodes, very deep red color
(assuming Fe/traces are in sufficient amounts)

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