Now this could be totally unrelated, but, I recently sprayed everything with orthenex. Next thing I knew, the leaves were burned, and the sphagnum turned white. I washed off the plants, and ran several gallons of fresh water through the pots. Now, 2 weeks later, the sphagnum is green, and the newer leaves look healthy and ready to eat their quota in insects. Did you spray with an insecticide/fungicide like orthenex by chance? Could be it wasn't cut properly like mine was, and caused the problem. If that isn't it, I have little left to say.