The red plant on the far right in the 75 looks like Barclaya longifolia.
That's the only really red plant with lanceolate leaves that I know
of. It grows more or less red depending on light intensity and
nitrates. Some of the crypts have colored leaves, but they're usually
more purple. Barclaya is a notoriously difficult plant to grow and the
clump in the 29 is gorgeous.

My plants do not flower. I have always thought of them as some kind
of Cript. I remember them as starting with green leaves and then
turning. The long leaves in the 29 gallon tanks are pale green on top
and rust red on the bottom whereas the bottom of the leaves in the 75
are almost totally totally rust red with green mixed with red on the
top. I know both tanks were planted with the same starters.

Barclaya leaves are fairly thin compared to the fleshy leaves of
Crytocoryne which, remember, are tough enough to grow emersed.

if I had to guess which crypt I'd say WIL. Maybe UND, it's a bit
red for WIL but that could be the lights.

http://crypts.aquaria.net/

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