Sounds like hydration is not the issue then. Phrag. kovachii does like to grow in media with a high pH (alkaline), so maybe you are growing yours too acidic, so it can't take up all the nutrients and becomes nutrient deficient, that would explain the yellow leaves. We have been growing ours in either diatomite or in Growstone which will prevent the media from becoming too acidic. As I said before we are growing ours in an eb and flow system, with a water pH around 7.0. When we were first growing them we had them potted in bark, and sitting in water (in saucers) and noticed the same thing, that they would form flower spikes but they would abort, also we noticed the yellowing of the leaves. So I do think they benefit from getting watered twice a day with fresh water that probably contains more oxygen, rather than sitting in water that is stagnant. So my recommendation would be, if it growing in bark to change it to Growstone or Diatomite, check the pH of your irrigation water and make sure it is around 7, and either grow it in an eb and flow system, or make sure you give it fresh water at least once a day. The hybrids tend to be less picky and do well for us in either bark or Growstone sitting in a saucer with water.
Hope this helps,
Robert
