Sad looking porroglossum muscosum

[m_ms09]

My Porroglossum muscosum doesn't seem to be doing so well. I got it from a friend and am growing it in a large tank to maintain adequate humidity, etc.
Anyway, the humidity is 95% ALL the time, and the temperature fluctuates from about 16 degrees Celsius at night to 21-ish during the day.
It is right under a 6500K light (around 1600 lumens, I believe), which is on for 16 hours a day.

The new leaves on this porroglossum are very dark and very small -- they don't seem to be growing AT ALL and it makes me very sad.

Maybe someone knows why this could be?