problem with a phalenopsis

[Tezas]

Hello,

I have an orchid - phalenopsis. I bought about a month ago and it was blooming, but unfortunately the top with the flowers broke. So I cut off the seem above the third node. I have not fertilized yet.
I water it ca. once a week, only in the morning, making sure the water freely flows out. The soil is practically dry then, but little drops of water gather at the pot and there seems to be a little moss inside the pot.
The temp in the room is ca. 18 degrees C at day and ca. 15 degrees C at night.

I noticed ca. 2 weeks ago that the leaves are drooping; some air-roots seem wilting (and are soft to touch). Under the link I attach the pictures of the plant:
fotoforum.gazeta.pl/5,2,tezas
.html

in short, it seems not to be doing well. I also notice a white residue on some of the bark (picture ending with ‘5’). What should I do to save it? Its flowers were beautiful and I’d love to see them again…

I’ve already lost one orchid and I’d like to avoid losing this one as well..

[BunnytheOrchid]

Welcome to the forum Tezas!
"wilting" roots or roots soft to the touch makes me think they might be rotting. Are they brown and mushy? The leaves and roots might be not doing as well because of too much water in the pot. But how much light, how much humidity and air circulation might also be necessary to know what's affecting the orchid. It sounds like since there is some condensation in pot, there is still some moisture in the pot. Maybe try waiting ten days rather than just a week? Even when the top of the mix feels dry, that doesn't mean the bottom or middle mix is dry, or at least dry enough.

As for the white residue, I'm not sure what that could be. The link to the pictures doesn't seem to be working, so I can't see what it looks like.