I have a crypt tank that the lutea is dark green in- 2.25wpg, no CO2. A
daughter off the same plant in a 10g tank with 4.5wpg and CO2 is deep
bronze with green veins. Genetically the same plant- both are healthy
and growing and have been for some time. Crypts are difficult to ID and
the appearance can vary widely for species like lutea and wendtii
depending on growing conditions.

James