Cryptocoryne albida (submersed) turns red

I have Cryptocoryne albida (or C. costata if you prefer) for some time. It grew quite big, but since I neglected my tanks during summer it was nothing fancy. Recently I have started to add CO2 and PMDD again and the results came quite quickly. New leaves are turning red/brown and the plant became huge.

It is placed in my tank “Metamorphoses“.

Cryptocoryne albida (submersed) Oct 17 2013 (1)

Cryptocoryne albida (submersed) Oct 17 2013 (1)

Cryptocoryne albida (submersed) Oct 17 2013 (2 - detail)

Cryptocoryne albida (submersed) Oct 17 2013 (2 – detail)