Angraecum didieri dying?

[critterguy]

Have an Angraecum didieri that is in a terrarium as shown here.

Pygmy chameleon tank - Dendroboard

top is full screen. Lighting my a LED aquarium light. Gets sprayed anywhere from 1-2x per day-I avoid thoroughly wetting it. Seems like it is able to dry out in a few hours. The tank has a screen top and good ventilation. A few inches away and sprayed more liberally Stelis hirtzii is growing quite well.

The plants came in a pot so I un-potted it, removed most of the substrate, and then tied it up against the hygrolon tube you see in the picture.

Some of the roots have died back...but the plant has also grown a few new roots. However today I noticed three lower leaves were black and dying and a couple more fell off when I touched the plant. Is it getting too much water? I find that hard to believe.