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<<I'm not certain about the Crypts and the Ammania coloration but it does
seem likely that the pigments(such as reds) for wave length absorption are
produced for less light and more light. Crypts don't follow this pattern nor
do Ammania necessarlly either. By adding more light and more light we should
get a green plant submersed but this does not happen.....................at
least in our tanks under submersion.
Perhaps it is an "automatic" response to submersion that is independent
of light levels?>>
but what about plants like Rotala spp. that tend to develop red leaves as
they grow near the light and green leaves at low light levels?
ljjones at students_wisc.edu