Angraecum? Black leaves falling off

[Jenn4a]

I’m not sure what’s wrong with this guy.
I water it every week or every other week and let the water sit in the tray. The room which it was in typically is hot and dry because I use T5HO. I moved my angraecums downstairs near some led lights for now, where it’s much cooler.
I’ve sprayed it with physan a month or so, but the leaves keep turning black and falling off. There is good circulation, from a swiveling fan.
I’ve also put in some rootblast fertilizer a week ago.

I avoid getting the leaves wet otherwise. Both my angraecums have dropped leaves, but currently the other one doesn’t have any black leaves. It’s just in need of some soaking because it’s dry.


I leave my orchids at my house, and I live on campus. I make weekly visits usually. My phals and paphs seem happy. It’s just these guys!

update:
humidity is house conditions with the heater one.
the temperatures range from 68 - 75 (estimated.)

I have an Angraecum eburneum, and a larger NOiD with each leaf being around 12" long. I am not sure of the ID if someone would be willing to take a shot. it is the one pictured. it is down to 5 leaves. I would say that it has lost nearly 10 leaves.

The huge angraecum (NOiD) has lost more leaves since, and my other one is very dehydrated. I agree with the below comments that my watering schedule is less than ideal.
The Angraecum eburneum(not pictured) has only three leaves left, and one of the leaves was cut off due to the black spreading down.
I do notice that the leaf snaps off dry and it doesn't spread to the very center.. the joints remain dry.


I grow carnivorous plants in my apartment, but do not have the space to grow large orchids there. I never intended to hurt my precious babies, and these Angraecums seem to be the only ones with significant issues. I know my growing conditions are less than ideal, but I do plan to build a greenhouse once I graduate and move out of my current apartment. I also grow a few carnivorous plants at the house with orchids, so using distilled water is convienient for me. I did put some slow release fertilizer in all my orchid pots.