plants showing signs of getting incorrect light

[Zyzzyzus]

Hello,

I have a Barbosella cogniauxania and a Stelis repens in a terrarium. I noticed yesterday that the Barbosella is turning purple in places, the way plants do when they get too much sun. The Stelis is looking a bit dark. It seems like the obvious solution is to switch them, but is that likely to be more traumatic than leaving them in places with less than ideal lighting? I am getting a couple more plants on Thursday, one which is definitely supposed to like more light than the Barbosella, so I could mount it in a way that shades the Barbosella. But that still wouldn't help the Stelis.

Thanks!

[Jade]

how big this terrarium is?
I'm asking because you could use two different lights, one(lighter) for stelis and barbosella, and another one (stronger) for the other orchids that are coming.

[King_of_orchid_growing:)]

It is far more stressful to the plants when they are left in areas they do not tolerate well. I recommend changing their positions.

You could also try what Jade had mentioned if applicable.

[Zyzzyzus]

Thanks! The terrarium is very small (8x8x12 inches) so there is really only room for the one light but I will move the Stelis so that it is shading the Barbosella. If it looks like the plants I have won't survive or something in this setup, I will move them to a bigger space with more microclimates but I really love the portability of this small terrarium. And so far both have been putting out new growth. So I hope that if I can get their light needs sorted out they'll be good to go.

Incidentally, are there things I should be looking for that would mean I need to take immediate action to insure their survival?