Dendrobium Blue Twinkle - Culture

[Syrinth]

Hey everyone, I've had this one for awhile and it's... surviving but not doing well. It puts forth new growths, but they always wind up shrivelled and leaves ocassionally drop off of it.

It's currently potted in bark, about medium size, located directly under my growing light beside some paphs *which are doing well*.

I originally had it potted solely in sphagnum moss but repotted because the roots kept on dying so I felt it needed more drainage. PLanning to put some moss in there with the bark tonight.

Thoughts?