Bhart90 wrote:No comment.................
The roots look really good! I'm going to guess (and this is totally a guess) that if you have them in a "dome" you might be smothering them. Having plants in a terrarium is OK for some species if you're careful, but you can't let the heat build up. I put some of my capensis in a little 2.5gal fish tank under a new light, thinking it would help retain humidity, and ended up nearly frying the taller one because of the heat getting trapped at the top.
I would suggest not
putting the plants under anything that's going to hinder air flow. I don't know this for sure, but it seems like in my experience, plants appreciate some air exchange and actually don't like it to be too humid.
Keep in mind I have very limited experience, pretty much just D. capensis, spathulata and other easy ones like that.
Edit: Also, RINSE YOUR MEDIA WELL!! Even if you forgot to when you just repotted, flush that stuff out really well by top watering a few times and discarding the water. The media I get has so much fine muck in it that I lose about 1/3 of the volume when I rinse it, but the results speak for themselves