Haraella retrocalla with yellowing midstem leaves

[dcpoole]

So the oldest and the newest leaves look hale and healthy, but it's those middle-aged ones that are in crisis!

I noticed one of them looking a little chlorotic a few weeks after its first bloom for me, so I cut back on light and paid more attention to watering. I was rewarded with lots of new root growth and 3 new spikes for a total of 4, but the yellowing continues and has progressed to obvious withering. It's pretty evenly distributed across the affected leaves, which is to say there aren't any spots or patches. All midstem, all right around the new root and spike growth.

The plant is housed in an open terrarium with natural west-facing window light in summer, and a supplemental light over winter. Fertilized every 2-4 weeks.

As an aside, I feel like 4 spikes at once is overachieving and I'll be happy to nip some off if that's advised.