(Probably?) oncidium going pale and drying up

[narquelie19]

Hi everyone,

I used to be a member here ages ago, but have forgotten my username/password since. (That being said, I'm still a huge beginner at this.) I'm rejoining because I'm really worried about one of my orchids and would be extremely grateful for any help.

I got this orchid from my local botanic garden about 3 years ago - they'd had an exhibition and were giving out orchids in unlabelled pots. I think it's an oncidium, but that's as far as I've got with google.

I'd only ever had a Phal before, so I've had no idea how to care for it and I don't think it's ever looked 100% healthy (though it did flower once). I repotted it about 3 months ago and discovered maybe 70% of the roots were soggy/probably rotten. I cut that off and repotted in a bark/perlite medium which my local florist said would be good. (The bark is in much smaller bits than the one I use for my phal, but I don't know if that's a bad thing.)

I also moved house about 3 months ago, so the temperature/humidity conditions have changed. I'd say it's around 22 degrees C during the day and 20 at night.

Anyway, basically it's looking less and less well. Some bits are drying off, and all the leaves are sort of weird and brittle. They're also paler than they used to be. One of the bulbs seems to have a dark bit at the bottom as well. I've attached some photos that hopefully help.

Any thoughts, advice, suggestions on how to nurse this orchid back to health? Thanks so much


Edit to add it was tilting out of its pot before I repotted, and I did my best to repot it straight. It worked for about a month, but it's now slowly falling to one side again...