One of my pots of D. burmannii "Green" has suddenly started to look irritated, and I can't pinpoint exactly why. Nothing has changed about its conditions for several months - 75F day temps, 60F night, growing in the same tank as my other subtropical 'dews (D. sessilifolia, other forms of D. burmannii, D. hartmeyerorum, D. nidiformis, D. finlaysoniana, etc.) which are all happy. I know that it would probably prefer temperatures a bit warmer, but I don't think this is the problem since they've been growing fine for several months, and all of my other D. burmannii are healthy. The media is fairly fresh, no more than 6 months old. My first thought was that they've been exposed to excessively high TDS, but all of the plants that they share a water tray with do not show symptoms. It is also only the larger plants that appear to be affected.