Very cool! I just separated my adelae clump a few weeks ago and repotted them into better media. They're doing quite well and I hope they one day look like that!
Are they planted in a clear tub? If so I'm surprised we don't see any plantlets growing on the side behind the plastic.
I love that, very very nice! You must have them fairly close to lights- when I grew indoors I liked to keep some there (where they would become even smaller than yours and red), and some out in a more shade spot where they would get really big and green.
Thanks! They're just below a west facing picture window. No additional lights. Under really bright lights they would turn red. I like them green personally.
Do you know what the humidity is for the spot where they are standing?
Mine never had problems at 40-50%
Mine died back to the roots over and over until I finally boosted the humidity. But I have read that quite a few people struggled or struggle with this species and they all seem to relate it to humidity.