What's happening to my Catt?
 

Noticed this started about a month ago. I didn't think much about it, but it's looking worse. Seems to only be this orchid. I haven't changed anything that I've been doing for it for over a year.

What are your temperatures day/night? Humidity? Was it against a window on a cold night?

Inside my terrarium, under LEDs and filtered, western sun. Temps between 66 at night, and maybe as high as 78 during the day. Humidity around 60-80%.

This is not necessarily the case ----- as just assuming there are no element deficiencies.

But posting this link -- just in case ..... (link).

It looks like heat or frost damage. Not sure how that could have happened,

This article should help: https://staugorchidsociety.org/PDF/C...ySueBottom.pdf

---------- Post added at 09:35 PM ---------- Previous post was at 09:29 PM ----------

Actually, I just re-read this article and it reminded me of some solutions for a C. warscewiczii that is giving me trouble similar to yours, with the dieback on the tips of the new growth.

I never think of calcium deficiency because my water has so much.

Calcium deficiency was my first thought. There are many ways to provide calcium, but dissolving a teaspoon of gypsum (or plaster of Paris) per gallon is one way, add a cup of that solution to a gallon of water.

You can also use calcium nitrate fertilizer, available in better-stocked garden centers.

Calcium translocates poorly within plants, so it is best to provide it while the plant is growing.

Also consider magnesium deficiency.